Prof. Jan ­ Keller

Veranstaltungen vergangener Semester finden Sie im LSF.

Sommersemester 2025:

• Seminar Forschungsbegleitung (Bachelor)
• Seminar Forschungsbegleitung (Master)
• Seminar "(Un)gesunde Lebensstile so untersuchen wie sie gelebt werden: Überblick über Ecological Momentary Assessment Studien" (Master)

Rolle in wissenschaftlichen Gruppen

2025              Mitglied des Wissenschaftlichen Beirats zum Dritten Präventionsbericht der Nationalen Präventionskonferenz (NPK)

2025              Mitglied des Wissenschaftlichen Komitees der 39. Konferenz der European Health Psychology Society (EHPS) in Groningen (2025)

Seit 2024       Mitglied des „Standing Committee” des Mentor:innen-Programms der EHPS

Seit 2020       Mitglied im Consulting Editorial Board: Applied Psychology: Health and Well-being

Seit 2019       Mitglied der Special Interest Group "Equity, Global Health and Sustainability" der EHPS

Seit 2023	Leitung der Nachwuchsgruppe AMBER (Active mobility for maintained benefits of health and environment)
2018-2025	Postdoc und Wissenschaftlicher Mitarbeiter im Arbeitsbereich Gesundheitspsychologie der Freien Universität Berlin
2017	Forschungsaufenthalt und Tandemprojekt an der University of British Columbia (Vancouver, Kanada) mit Theresa Pauly, Arbeitsgruppe: The Health and Adult Development Lab (Prof. Dr. Christiane Hoppmann)
2016	Forschungsaufenthalt und Tandemprojekt an der Columbia University (New York City, USA) mit Dr. Corina Berli, Arbeitsgruppe: Couples Lab (Prof. Dr. Niall Bolger)
2013-2018	Doktorand und Wissenschaftlicher Mitarbeiter im Arbeitsbereich Gesundheitspsychologie der Freien Universität Berlin, Projekte "Bewegter Alltag" und "PrevOP"
Februar 2013	Master of Science in Psychologie an der Freien Universität Berlin
2010 - 2013	Studentische Hilfskraft im Arbeitsbereich Gesundheitspsychologie der Freien Universität Berlin
2007 - 2010	Bachelor of Science in Psychologie an der Freien Universität Berlin
2007	Abitur am Carl-Friedrich-Gauß-Gymnasium in Frankfurt (Oder)

Publikationen (peer-reviewed)

2025

Brockmeier, L. C., Keller, J., Dingler, T., Paduszynska, N., Luszczynska, A., & Radtke, T. (2025). Planning a digital detox: Findings from a randomized controlled trial to reduce smartphone usage time. Computers in Human Behavior, 168. https://doi.org/10.1016/j.chb.2025.108624   

 

Brockmeier, L.C. Mertens, L., Roitzheim, C., Radtke, T., Dingler, T., & Keller, J. (2025). Effects of an intervention targeting social media app use on well-being outcomes: A Randomized Controlled Trial. Applied Psychology: Health and Well-Being, 17(1). http://dx.doi.org/10.1111/aphw.12646

 

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

 

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. https://doi.org/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.125931

 

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

 

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

 

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

 

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

 

Sonstige Publikationen

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.

ResearchGate:

https://www.researchgate.net/profile/Jan-Keller

ORCID:

https://orcid.org/0000-0003-4660-6844