Education and Academic Positions

Since 2023	Lead of the junior research group AMBER (Active mobility for maintained benefits of health and environment)
Since 2018	Post–doctoral research fellow at the Division of Health Psychology (Prof. Nina Knoll) at the Freie Universität Berlin
2017	Research stay and tandem project at University of British Columbia (Vancouver, Canada) with Theresa Pauly, The Health and Adult Development Lab (Supervisor: Prof. Dr. Christiane Hoppmann)
2016	Research stay and tandem project at Columbia University (New York City, USA) with Dr. Corina Berli, Couples Lab (Supervisor: Prof. Dr. Niall Bolger)
Since 2015	SUPPORT: Qualification programme for university didactics, Freie Universität Berlin
2013 - 2018	PhD-Student and research associate at the Division of Health Psychology (Prof. Nina Knoll) at the Freie Universität Berlin; projects: "Days in motion" and "PrevOP"
Februar 2013	Master of Science in Psychology at the Freie Universität Berlin
2010 - 2013	Student research assistant at the Division of Health Psychology at the Freie Universität Berlin
2007 - 2010	Bachelor of Science in Psychology at the Freie Universität Berlin
2007	A-levels in Frankfurt (Oder), Germany

 Awards / Grants

2022	Grant for the project "FUB Climate Challenge"; funded by the FUturist program of the Freie Universität Berlin
2021	Grant for a joint graduate program between the University of Melbourne and the Berlin University Alliance; funded by the Excellence Strategy of the German Government through the Berlin University Alliance
2019	Herman Schaalma Dissertation Award of the European Health Psychology Society
2018	Graduate Student Achievement Award of the International Association of Applied Psychology (IAAP; Division 8)
2017	Conference grant funded by the German Academic Exchange Service (Italy)
2017	Quinn Exchange Fellowship of the Department of Psychology (University of British Columbia, Vancouver, Canada) for a tandem exchange with The Health and Adult Development Lab
2016	CREATE Tandem Grant of the European Health Psychology Society
2015	Conference grant funded by the German Academic Exchange Service (Cyprus)

Activities in scientific communities:

Since 2021	Member of the Open Digital Health initiative
Since 2021	Member of the Task and Finish group for the European Health Psychology Society (EHPS) mentoring scheme
Since 2020	Consulting Editorial Board: Applied Psychology: Health and Well-being
Since 2019	Member of the Special Interest Group "Equity, Global Health and Sustainability" of the EHPS
2016 - 2021	Treasurer of the SYNERGY Executive Committee of the EHPS
2018 - 2019	Member of the Scientific Committee for the 33rd Conference of the EHPS in 2019
2015 - 2017	Member of the EHPS e-courses Committee
2013 - 2016	Treasurer of the CREATE Executive Committee of the EHPS

Ad hoc Reviewer

• Addictive Behaviors; Annals of Behavioral Medicine; Anxiety, Stress & Coping; Appetite; Applied Psychology: Health and Well-Being; BMC Public Health; BMJ Open; British Journal of Health Psychology; European Health Psychologist; European Journal of Health Psychology; European Journal of Psychological Assessment; Gerontology; Health Psychology; Health Psychology and Behavioral Medicine: an Open Access Journal; Health Psychology Review; International Journal of Behavioral Medicine; International Review of Sport and Exercise Psychology; Jornal de Pediatria; Journal of Medical Internet Research; Journal of Behavioral Medicine; Journal of Occupational and Environmental Medicine; Journal of Science and Medicine in Sport; Journal of Social and Personal Relationships; Journal of Sport and Health Science; PLOS ONE; Psychology, Community & Health; Psychology of Sport and Exercise; Psychology & Health; Rehabilitation Psychology; Social Science & Medicine; The Journal of Climate Change and Health

Member in the following scientific communities:

• Society for Ambulatory Assessment (SAA)
• International Association of Applied Psychology (IAAP)
• European Health Psychology Society (EHPS)
• SYNERGY (Subdivision of the EHPS)
• Collaborative Research and Training in the EHPS (CREATE; Subdivision of the EHPS)
• Deutsche Gesellschaft für Psychologie (DGPs)

Research Projects

Multispecies Campus (2024-2025)	A Living Lab at Freie Universität Berlin for biodiversity, creativity and health
AMBER (2023-2028)	Junior research group AMBER (Active mobility for maintained benefits of health and environment)
FU Climate Challenge (2022)	An intervention study to promote sustainable mobility and nutrition among students and employees of the Freie Universität Berlin
HASCI (2022)	Two studies within the project "HASCI" (Healthy, Active and Sustainable Commuting Intervention). HASCI 1: An intensive longitudinal study with individuals on habit formation of an active and sustainable commuting behavior (www.drks.de/DRKS00028479); HASCI 1plus1: An n-of-1 study with dyads to promote active and sustainable commuting behaviors (www.drks.de/DRKS00028772)
Public Climate School (2021)	Evaluating the Public Climate School - a multi-component school-based program to promote climate awareness and action in students: A controlled pilot study (www.drks.de/DRKS00027021)
ERNA (2020)	An intensive longitudinal study on habit formation of hand washing behavior (www.drks.de/DRKS00022067)
Hand washing during COVID-19 pandemic (2020)	A longitudinal study on health behavior change during the COVID-19 pandemic: Hand washing (https://clinicaltrials.gov/ct2/show/NCT04367337)
Contenance (2019)	A randomized controlled trial to evaluate the efficacy of a mobile intervention on healthy smartphone use (www.drks.de/DRKS00017606)
HABIT (2019)	A randomized controlled trial to evaluate the efficacy of time- and routine-based cues on habit formation (www.drks.de/DRKS00016720)
Gesprächsstudie (2018-2019)	Examining age-related changes of empathic accuracy using an experimental paradigm
Happy5 (2016)	A randomized controlled trial to evaluate effects of a planning and self-efficacy intervention to augment fruit and vegetable consumption
PrevOP (2016-2017)	Preventing the impairment of primary Osteoarthritis by high impact long-term Physical exercise regimen (www.drks.de/DRKS00009677)
DiM (2013 - 2016)	"Days in Motion": A planning intervention study with couples to enhance daily physical activity (www.clinicaltrials.gov/ct2/show/NCT01963494)

Research interests:

• Social exchange processes and health promotion (e.g. dyadic planning)
• Self-regulatory strategies and health behavior change
  
  • Action Planning, Action Control, Self-efficacy
• Processes of habit formation
• Coping of illnesses and associated consequences
• Health promotion and climate protection

Journal articles (peer-reviewed)

2024

Keller, J., Herrmann-Schwarz, T., Roitzheim, C., Mertens, L., Brockmeier, L.C., & Purohit, A.K. (2024). A digital nudge-based intervention to interrupt Instagram usage. European Journal of Health Psychology, 31(3), 128-140. https://doi.org/10.1027/2512-8442/a000150

Keller, J.*, Eichinger, M.*, Bechtoldt, M., Liu, S., Neuber, M., Peter, F., Pohle, C., Reese, G., Schäfer, F., & Heinzel, S. (2024). Evaluating the Public Climate School - a multi-component school-based program to promote climate awareness and action in students: A cluster-controlled pilot study. The Journal of Climate Change and Health, 15, 100286. https://doi.org/10.1016/j.joclim.2023.100286 

* Shared first authorship

Brockmeier, L.C. Mertens, L., Roitzheim, C., Radtke, T., Dingler, T., & Keller, J. (in press). Effects of an intervention targeting social media app use on well-being outcomes: A Randomized Controlled Trial. Applied Psychology: Health and Well-Being. doi: 10.1111/aphw.12646

Lorbeer, N., Schwarzer, R., Keller, J., Di Maio, S., Domke, A., Armbrecht, G., Börst, H., Martus, P., Ertel, W., Luszczynska, A., & Knoll, N. (in press). Volitional processes in changing physical activity: A randomized controlled trial with individuals with knee osteoarthritis. Health Psychology. https://doi.org/10.1037/hea0001453 

Di Maio, S., Wilhelm, L. O., Fleig, L., Knoll, N., Keller, J. (in press). Habit substitution towards more active commuting. Applied Psychology: Health and Well-Being. doi: 10.1111/aphw.12623

Bethke, N., O’Sullivan, J., Keller, J., von Bernuth, H., Gellert, P.*, & Seybold, J.* (2024). Increasing vaccinations through an on-site school-based education and vaccination program: A city-wide cluster randomized controlled trial. Applied Psychology: Health and Well-Being, 16(3), 1326-1348. https://doi.org/10.1111/aphw.12528 

* Shared last authorship

Schenkel, K., Nussbeck, F. W., Kerkhoff, D., Scholz, U., Keller, J., & Radtke, T. (2024). Digital generation: the association between daily smartphone app use and well-being. Behaviour & Information Technology, 1-18. https://doi.org/10.1080/0144929x.2024.2406255  

2023

Heinzel, S., Tschorn, M., Schulte-Hutner, M., Schäfer, F., Reese, G., Pohle, C., Peter, F., Neuber, M., Liu, S., Keller, J., Eichinger, M., & Bechtoldt, M. (2023). Anxiety in response to the climate and environmental crises: validation of the Hogg Eco-Anxiety Scale in Germany [Brief Research Report]. Frontiers in Psychology, 14. https://doi.org/10.3389/fpsyg.2023.1239425  

Lorbeer, N., Knoll, N., Keller, J., Domke, A., Di Maio S., Armbrecht, G., Börst, H., Martus, P., Ertel, W., & Schwarzer, R. (2023). Enhancing physical activity and reducing symptoms of patients with osteoarthritis of the knee: a randomized controlled trial of the PrevOP-Psychological Adherence Program. BMC Musculoskeletal Disorders, 24, 550. https://doi.org/10.1186/s12891-023-06661-x

Brandt, A., Breucker, L., Keller, J., Corman, V. M., Bethke, N., & Seybold, J. (2023). Seropositivity and flight-associated risk factors for SARSCoV-2 infection among asylum seekers arriving in Berlin, Germany – a cross-sectional study. Frontiers in Public Health, 11, 1134546. https://doi.org/10.3389/fpubh.2023.1134546 

Gerstberger, L., Blanke, E. S., Keller, J., & Brose, A. (2023). Stress buffering after physical activity engagement: An experience sampling study. British Journal of Health Psychology, 28(3), 876-892. https://doi.org/10.1111/bjhp.12659   

Perski, O., Kwasnicka, D., Kale, D., Schneider, V., Szinay, D., ten Hoor, G., Asare, B. Y.-A., Verboon, P., Powell, D., Naughton, F., & Keller, J. (2023). Within-person associations between psychological and contextual factors and lapse incidence in smokers attempting to quit: A systematic review and meta-analysis of Ecological Momentary Assessment studies. Addiction, 118(7), 1216-1231. https://doi.org/10.1111/add.16173   

Szczuka, Z., Siwa, M., Abraham, C., Baban, A., Brooks, S., Cipolletta, S., . . . Luszczynska, A. (2023). Handwashing adherence during the COVID-19 pandemic: A longitudinal study based on protection motivation theory. Social Science & Medicine, 317, 115569. https://doi.org/10.1016/j.socscimed.2022.115569  

Gardner, B., Arden, M. A., Brown, D., Eves, F. F., Green, J., Hamilton, K., . . . Lally, P. (2023). Developing habit-based health behaviour change interventions: twenty-one questions to guide future research. Psychology & Health, 38(4), 518-540. https://doi.org/10.1080/08870446.2021.2003362

2022

Keller, J., Kwasnicka, D., Wilhelm, L. O., Lorbeer, N., Pauly, T., Domke, A., Knoll, N., & Fleig, L. (2022). Hand washing and related cognitions following a brief behavior change intervention during the COVID-19 pandemic: a pre-post analysis. International Journal of Behavioral Medicine, 29(5),575-586. https://doi.org/10.1007/s12529-021-10042-w  

Perski, O., Keller, J., Kale, D., Asare, B. Y.-A., Schneider, V., Powell, D., Naughton, F., ten Hoor, G., Verboon, P., & Kwasnicka, D. (2022). Understanding health behaviours in context: A systematic review and meta-analysis of Ecological Momentary Assessment studies of five key health behaviours. Health Psychology Review, 16(4), 576-601. https://doi.org/10.1080/17437199.2022.2112258

Eichinger, M., Bechtoldt, M., Bui, I. T. M., Grund, J., Keller, J., Lau, A. G., . . . Heinzel, S. (2022). Evaluating the Public Climate School - A school-based programme to promote climate awareness and action in students: Protocol of a cluster-controlled pilot study. International Journal of Environmental Research and Public Health, 19(13), 8039. https://doi.org/10.3390/ijerph19138039 

Di Maio, S., Keller, J., Kwasnicka, D., Knoll, N., Sichert, L., & Fleig, L. (2022). What helps to form a healthy nutrition habit? Daily associations of intrinsic reward, anticipated regret, and self-efficacy with automaticity. Appetite, 175, 106083. https://doi.org/10.1016/j.appet.2022.106083

Radtke, T., Apel, T., Schenkel, K., Keller, J., & von Lindern, E. (2022). Digital detox: An effective solution in the smartphone era? A systematic literature review. Mobile Media & Communication, 10(2), 190-215. https://doi.org/10.1177/20501579211028647

Swora, E., Boberska, M., Kulis, E., Knoll, N., Keller, J., & Luszczynska, A. (2022). Physical activity, positive and negative symptoms of psychosis, and general psychopathology among people with psychotic disorders: A meta-analysis. Journal of Clinical Medicine, 11(10), 2719. https://doi.org/10.3390/jcm11102719

Domke, A., Keller, J., Knoll, N., Sniehotta, F. F., Heuse, S., & Wiedemann, A. U. (2022). Plan pursuit in the context of daily fruit and vegetable consumption: The importance of cue detection and the execution of the planned behaviour for overall behaviour change. British Journal of Health Psychology, 27, 1172-1187. https://doi.org/10.1111/bjhp.12593  

Warner, L. M., Fleig, L., Wolff, J. K., Keller, J., Schwarzer, R., Nyman, S., & Wurm, S. (2022). What makes implementation intentions (in)effective for physical activity among older adults? British Journal of Health Psychology, 27(2), 571-587. https://doi.org/10.1111/bjhp.12563

Kwasnicka, D., Keller, J., Perski, O., Potthoff, S., ten Hoor, G. A., Ainsworth, B., . . . Sanderman, R. (2022). White Paper: Open Digital Health – accelerating transparent and scalable health promotion and treatment. Health Psychology Review, 16(4), 475-491. https://doi.org/10.1080/17437199.2022.2046482 

Luszczynska, A., Szczuka, Z., Abraham, C., Baban, A., Brooks, S., Cipolletta, S., . . . Wolf, H. (2022). The interplay between strictness of policies and individuals’ self-regulatory efforts: associations with handwashing during the COVID-19 pandemic. Annals of Behavioral Medicine, 56 (4), 368-380. https://doi.org/10.1093/abm/kaab102  

Kulis, E., Szczuka, Z., Keller, J., Banik, A., Boberska, M., Kruk, M., . . . Luszczynska, A. (2022). Collaborative, dyadic, and individual planning and physical activity: A dyadic randomized controlled trial. Health Psychology, 41(2), 134-144. https://doi.org/10.1037/hea0001124

2021

Keller, J., Roitzheim, C., Radtke, T., Schenkel, K., & Schwarzer, R. (2021). A mobile intervention for self-efficacious and goal-directed smartphone use in the general population: Randomized controlled trial. JMIR Mhealth Uhealth, 9(11), e26397. https://doi.org/10.2196/26397

Keller, J., Kwasnicka, D., Klaiber, P., Sichert, L., Lally, P., & Fleig, L. (2021). Habit formation following routine-based versus time-based cue planning: A randomized controlled trial. British Journal of Health Psychology, 26(3), 807-824. https://doi.org/10.1111/bjhp.12504

Inauen, J., Contzen, N., Frick, V., Kadel, P., Keller, J., Kollmann, J., . . . van Valkengoed, A. M. (2021). Environmental issues are health issues: Making a case and setting an agenda for environmental health psychology. European Psychologist, 26(3), 219-229. https://doi.org/10.1027/1016-9040/a000438

Szczuka, Z., Abraham, C., Baban, A., Brooks, S., Cipolletta, S., Danso, E., . . . Luszczynska, A. (2021). The trajectory of COVID-19 pandemic and handwashing adherence: findings from 14 countries. Bmc Public Health, 21(1). https://doi.org/10.1186/s12889-021-11822-5

Szczuka, Z., Kulis, E., Boberska, M., Banik, A., Kruk, M., Keller, J., Knoll, N., Scholz, U., Abraham, C., & Luszczynska, A. (2021). Can individual, dyadic, or collaborative planning reduce sedentary behavior? A randomized controlled trial. Social Science & Medicine, 287, 114336. https://doi.org/10.1016/j.socscimed.2021.114336

Kwasnicka, D., Kale, D., Schneider, V., Keller, J., Yeboah-Asiamah Asare, B., Powell^, D., Naughton, F., ten Hoor, G., Verboon, P., Perski, O. (2021). Systematic review of Ecological Momentary Assessment (EMA) studies of five public health-related behaviours: Review Protocol. BMJ Open, 11(7), e046435. https://doi.org/10.1136/bmjopen-2020-046435

Hommes, F., van Loon, W., Thielecke, M., Abramovich, I., Lieber, S., Hammerich, R., . . . Mockenhaupt, F. P., & The BECOSS Study Group (2021). SARS-CoV-2 infection, risk perception, behaviour and preventive measures at schools in Berlin, Germany, during the early post-lockdown phase: A cross-sectional study. International Journal of Environmental Research and Public Health, 18(5), 2739. https://doi.org/10.3390/ijerph18052739

Domke, A., Keller, J., Heuse, S., Wiedemann, A. U., Lorbeer, N., & Knoll, N. (2021). Immediate effects of a very brief planning intervention on fruit and vegetable consumption: A randomized controlled trial. Applied Psychology: Health and Well-Being, 13(2), 377-393. https://doi.org/10.1111/aphw.12254

Di Maio, S., Keller, J., Hohl, D. H., Schwarzer, R., & Knoll, N. (2021). Habits and self-efficacy moderate the effects of intentions and planning on physical activity. British Journal of Health Psychology, 26(1), 50-66. https://doi.org/10.1111/bjhp.12452

2020

Keller, J., Hohl, D.H., Hosoya, G., Heuse, S., Scholz, U., Luszczynska, A., & Knoll, N. (2020). Long-term effects of a dyadic planning intervention with couples motivated to increase physical activity. Psychology of Sport & Exercise, 49, e101710. https://doi.org/10.1016/j.psychsport.2020.101710

Pauly, T.*, Keller, J.*, Knoll, N., Michalowski, V. I., Hohl, D. H., Ashe, M. C., Gerstorf, D., Madden, K. M.,. Hoppmann, C. A. (2020). Moving in sync: Hourly physical activity and sedentary behavior are synchronized in couples. Annals of Behavioral Medicine, 54(1), 10-21. https://doi.org/10.1093/abm/kaz019

* Shared first authorship

Boberska, M., Zarychta, K., Knoll, N., Keller, J., Hohl, D. H., Horodyska, K., Kruk, M., & Luszczynska, A. (2020). Maternal practices and perceptions of child body mass status explain child energy expenditure behaviors and body mass. Journal of Behavioral Medicine. 43(6), 904-915. https://doi.org/10.1007/s10865-020-00138-1

Di Maio, S., Keller, J., Job, V., Felsenberg, D., Ertel, W., Schwarzer, R., & Knoll, N. (2020). Health demands moderate the link between willpower beliefs and physical activity in patients with knee osteoarthritis. International Journal of Behavioral Medicine. 27(4), 406-414. https://doi.org/10.1007/s12529-020-09865-w

Knoll, N., Keller, J., Luszczynska, A., Scholz, U., Röcke, C., Schrader, M., & Heckhausen, J. (2020). Control strategies and daily affect: Couples adapt to new functional limitations. GeroPsych, 33, 155-169. https://doi.org/10.1024/1662-9647/a000229

2019

Domke, A., Keller, J., Fleig, L., Knoll, N., & Schwarzer, R. (2019). What makes a good action plan? Characteristics and enactment of fruit and vegetable plans. Appetite, 142, 104351. https://doi.org/10.1016/j.appet.2019.104351

Czekierda, K., Zarychta, K., Knoll, N., Keller, J., & Luszczynska, A. (2019). Links between meaning in life and physical quality of life after rehabilitation: Mediating effects of positive experiences with physical exercises and mobility. PLoS ONE, 14(10), e0224503. https://doi.org/10.1371/journal.pone.0224503

Stanczykiewicz, B., Banik, A., Knoll, N., Keller, J., Hohl, D.H., Rosinczuk, J., Luszczynska, A. (2019). Sedentary behaviors and anxiety among children, adolescents, and adults.: A systematic review and meta-analysis. BMC Public Health, 19, 459. https://doi.org/10.1186/s12889-019-6715-3

Hohl, D. H., Schultze, M., Keller, J., Heuse, S., Luszczynska, A., & Knoll, N. (2019). Inter-relations between partner provided support and self-efficacy: A dyadic longitudinal analysis. Applied Psychology: Health and Well-Being, 11(3), 522-542. https://doi.org/10.1111/aphw.12166

Fleig, L., Ashe, M. C., Keller, J., Lippke, S., & Schwarzer, R. (2019). Putting psychology into telerehabilitation: Coping planning as an example for how to integrate behavior change techniques into clinical practice. AIMS Medical Science, 6(1), 13-32. https://doi.org/10.3934/medsci.2019.1.13

Boberska, M., Horodyska, K., Kruk, M., Knoll, N., Hohl, D. H., Keller, J., & Luszczynska, A. (2019). Parental strategies restricting screen use among children, screen home environment, and child screen use as predictors of child body fat: A prospective parent–child study. British Journal of Health Psychology, 24(2), 298-314. https://doi.org/10.1111/bjhp.12354

2018

Keller, J., Motter, S., Motter, M., & Schwarzer, R. (2018). Augmenting fruit and vegetable consumption by an online intervention: Psychological mechanisms. Appetite, 120, 348-355. https://doi.org/10.1016/j.appet.2017.09.019

Knoll, N., Hohl, D. H., Motter, S., Keller, J., Lange, D., Felsenberg, D., Martus, P., Ertel, W., & Schwarzer, R. (2018). Facilitating physical activity and reducing symptoms in patients with knee osteoarthritis: Study protocol of a randomized controlled trial to test a theory-based PrevOP-Psychological Adherence Program (PrevOP-PAP). BMC Musculoskeletal Disorders, 19(1), 221. https://doi.org/10.1186/s12891-018-2158-8

Hohl, D. H., Lüscher, J., Keller, J., Heuse, S., Scholz, U., Luszczynska, A., & Knoll, N. (2018). Inter-relations among negative social control, self-efficacy, and physical activity in healthy couples. British Journal of Health Psychology, 23(3), 580-596. https://doi.org/10.1111/bjhp.12305

Boberska, M., Szczuka, Z., Kruk, M., Knoll, N., Keller, J., Hohl, D. H., & Luszczynska, A. (2018). Sedentary behaviors and health-related quality of life. A systematic review and meta-analysis. Health Psychology Review, 12, 195-210. https://doi.org/10.1080/17437199.2017.1396191

2017

Keller, J., Fleig, L., Hohl, D. H., Wiedemann, A. U., Burkert, S., Luszczynska, A., & Knoll, N. (2017). Which characteristics of planning matter? Individual and dyadic physical activity plans and their effects on plan enactment. Social Science and Medicine, 189, 53-62. https://doi.org/10.1016/j.socscimed.2017.07.025

Keller, J., Wiedemann, A. U., Hohl, D. H., Scholz, U. Burkert, S., Schrader, M., & Knoll, N. (2017). Predictors of dyadic planning: Perspectives of prostate cancer survivors and their partners. British Journal of Health Psychology, 22(1), 42-59. https://doi.org/10.1111/bjhp.12216

Fleig, L., Gardner, B., Keller, J., Lippke, S., Pomp, S., & Wiedemann, A. U. (2017). What contributes to action plan enactment? Examining characteristics of physical activity plans. British Journal of Health Psychology, 22(4), 940-957. https://doi.org/10.1111/bjhp.12263

Knoll, N., Hohl, D. H., Keller, J., Schuez, N., Luszczynska, A., & Burkert, S. (2017). Effects of dyadic planning on physical activity in couples: A randomized controlled trial. Health Psychology, 36, 8-20. https://doi.org/10.1037/hea0000423 

2016

Keller, J., Gellert, P., Knoll, N., Schneider, M., & Ernsting, A. (2016). Self-efficacy and planning as predictors of physical activity in the context of workplace health promotion. Applied Psychology: Health and Well-Being, 8(3), 301-321. https://doi.org/10.1111/aphw.12073

2015

Keller, J., Burkert, S., Wiedemann, A. U., Luszczynska, A., Schrader, M., & Knoll, N. (2015). Individual and dyadic planning predicting pelvic floor exercise among prostate cancer survivors. Rehabilitation Psychology, 60(3), 222-231. https://doi.org/10.1037/rep0000047

Hohl, D., Knoll, N., Wiedemann, A., Keller, J., Scholz, U., Schrader, M., & Burkert, S. (2015). Enabling or cultivating? The role of prostate cancer patients’ received partner support and self-efficacy in the maintenance of pelvic floor exercise following tumor surgery. Annals of Behavioral Medicine, 1-12. https://doi.org/10.1007/s12160-015-9748-6

Miscellanea

Foley, L., Knox, L., Durand, H., Fredrix, M., French, D., Hardeman, W., Keller, J., McSharry, J., Molloy, G., Morgan, K., Rodrigues, A., van Dongen, A., & Warner, N. (2023). An Update on the EHPS Ari Haukkala Mentoring Programme. The European Health Psychologist, 22, 1076-1080.

van Dongen, A., Kwasnicka, D., Hughes, A., Keller, J., Moylett, S., & Potthoff, S. (2020). Synergy: past, present, and future. The European Health Psychologist, 21, 697-700.

Berli, C., Keller, J. (2016). Dyadic health behaviour change: A Tandem project on couples' co-regulation of physical activity. The European Health Psychologist, 18(5), 212-125.

Presentations

2021

Keller, J., Kwasnicka, D., Klaiber, P., Sichert, L., Lally, P. & Fleig, L. (2021). Habit formation following routine-based versus time-based cue planning: A randomized controlled trial. Oral presentation at the 7th Conference of the Society of Ambulatory Assessment, 30 June - 2 July 2021 in Zurich, Switzerland.

2019

Keller, J., Hohl, D. H., Pauly, T., Hoppmann, C., & Knoll, N. (2019). Synchrony of physical activity in couples following a dyadic planning intervention. Oral presentation at the 14. Kongress der Fachgruppe Gesundheitspsychologie, 25-27 September 2019 in Greifswald, Germany.

Keller, J., Hohl, D. H., Pauly, T., Hoppmann, C., & Knoll, N. (2019). Synchrony of physical activity in couples following a dyadic planning intervention. Oral presentation at the 33rd Conference of the European Health Psychology Society, 03-07 September 2019 in Dubrovnik, Croatia.

2018

Keller, J., Pauly, T., Hohl, D. H., Knoll, N., & Hoppmann, C. (2018). Synchrony of physical activity and sedentary behaviour in couples. Oral presentation at the 51. Kongress der Deutschen Gesellschaft für Psychologie, 15-20 September 2018 in Frankfurt (Main), Germany.

Keller, J., Pauly, T., Hohl, D. H., Knoll, N., & Hoppmann, C. (2018). Synchrony of physical activity and sedentary behaviour in couples. Oral presentation at the 32nd Conference of the European Health Psychology Society, 21-25 August 2018 in Galway, Ireland.

Keller, J., Pauly, T., Hohl, D. H., Knoll, N., & Hoppmann, C. (2018). Synchrony of physical activity and sedentary behaviour in couples. Oral presentation at the 29th International Congress of Applied Psychology, 26-30 June 2018 in Montreal, Canada.

2017

Keller, J., Motter, S., Motter, M., & Schwarzer, R. (2017). Augmenting Fruit and Vegetable Consumption by an Online Intervention: Psychological Mechanisms. Oral presentation at the 31st Conference of the European Health Psychology Society, 29th August - 02nd September 2017 in Padua, Italy.

Keller, J., Hohl, D.H., Burkert, S., Hosoya, G., Scholz, U. &  Knoll, N. (2017). One-year follow-up effects of a dyadic planning intervention to increase physical activity: A randomized controlled trial with healthy couples. Oral presentation at the 13. Kongress der Fachgruppe Gesundheitspsychologie, 22-25 August 2017 in Siegen, Germany.

Keller, J., Pauly, T., Hohl, D. H., Knoll, N., & Hoppmann, C. (2017). Physical Activity Synchrony in Couples’ Accelerometer Data. Poster presentation at the 5th Conference of the Society of Ambulatory Assessment, 15-17 June 2017 in Esch an der Alzette, Luxembourg.

2016

Keller, J., Hohl, D. H., Knoll, N., Fleig, L., Wiedemann, A., & Burkert, S. (2016). Umsetzung von Handlungsplänen zur körperlichen Aktivität: Individuelle Pläne vs. dyadische Pläne. Oral Presentation at the 50. Kongress der Deutschen Gesellschaft für Psychologie, 18-22 September 2016 in Leipzig, Germany.

Keller, J., Hohl, D. H., Knoll, N., Fleig, L., Wiedemann, A., & Burkert, S. (2016). Plan Enactment of physical activities: Individual planning vs. Dyadic planning. Oral Presentation at the 30th Conference of the European Health Psychology Society, 23-27 August 2016 in Aberdeen, UK.

2015

Keller, J., Knoll, N., Wiedemann, A., Hohl, D.H., Schrader, M., & Burkert, S. (2015). Gemeinsam schaffen wir das: Dyadisches Planen von Beckenbodentraining für Männer. Oral Presentation at the 12. Kongress der Fachgruppe Gesundheitspsychologie, 17-19 September 2015 in Graz, Austria.

Keller, J., Wiedemann, A. U., Burkert, S., Hohl, D. H., Schrader, M., & Knoll, N. (2015). Predictors of dyadic planning of pelvic floor exercise: Perspectives of prostate cancer survivors and partners. Oral Presentation at the 29th Conference of the European Health Psychology Society, 02-05 September 2015 in Limassol, Cyprus.

2014

Keller, J., Wiedemann, A. U., Burkert, S., & Knoll, N. (2014). Sequentieller Einsatz individueller und dyadischer Planungsstrategien zur Steigerung des Beckenbodentrainings bei Patienten nach radikaler Prostatektomie. Oral Presentation at the 49th Kongress der Deutschen Gesellschaft für Psychologie, 21-25 September 2012 in Bochum, Germany.

Keller, J., Knoll, N., Wiedemann, A. U., & Burkert, S. (2014). Individual and dyadic planning as correlates of pelvic-floor training: A study with prostate cancer patients. Oral Presentation at the 28th Conference of the European Health Psychology Society, 26-30 August 2014 in Innsbruck, Austria.

2013

Keller, J., Gellert, P., Knoll, N., Schneider, M. & Ernsting, A. (2013). A brief workplace health promotion program for physical activity: Self-efficacy and planning as longitudinal predictors. Oral Presentation at Health Psychology Workshop,16 October 2013 at Newcastle University, UK.

Keller, J., Gellert, P., Knoll, N., Schneider, M., & Ernsting, A. (2013). A brief workplace health promotion program for physical activity: Self-efficacy and planning as longitudinal predictors. Oral Presentation at the 27th Conference of the European Health Psychology Society,16-20 July 2013 in Bordeaux, France.

2012

Keller, J., Gellert, P., Ernsting, A., & Schneider, M. (2012). Körperlich aktiver werden trotz höheren Alters?. Poster Presentation at the 48th Kongress der Deutschen Gesellschaft für Psychologie, 23-27 September 2012 in Bielefeld, Germany.