The website of the ICOH Committee on Shiftwork and Working Time, a committee of the International Commission on Occupational Health (ICOH)

The Working Time Society Board

Registered members of the WTS can send the board a message via wts-board(at)

President Stephen Popkin (1st Term)

Stephen Popkin, PhD is the Deputy Director of the United States Department of Transportation’s Volpe National Transportation Systems Center. The Volpe Center is an organization within the Office of the Secretary of Transportation responsible for systems level transportation analysis, engineering and research support: He received a doctorate degree in Industrial/Organizational Psychology from the University of Connecticut (USA), studying the impact of irregular and unpredictable work hours on locomotive engineers. Previously he has worked with the US submarine force and for a private contracting firm examining and addressing issues of fatigue, and earlier spent a year as a doctoral fellow at the Finnish Institute of Occupational Health conducting dose response sleep studies. He has served as the Rail Group Chair for the (U.S.) National Academies of Science, Engineering and Medicine’s Transportation Research Board, and as the Implementation Lead for the U.S. Department of Transportation’s Safety Council.


Secretary Claudia Moreno (1st Term)

Claudia RC Moreno, PhD, is Associate Professor at the School of Public Health, University of São Paulo, Brazil, since 2006. She is affiliated researcher at the Stress Research Institute at Stockholm University, Sweden, from 2015 to 2018, and board member of the Brazilian Sleep Society. Her research profiles are available at:


Scopus Author ID: 7202594197

Treasurer: Anna Arlinghaus (2nd Term)

 Anna Arlinghaus, PhD, is currently working as a senior consultant at XIMES GmbH, Austria / Germany. She graduated in Industrial/Organizational Psychology at University of Oldenburg, Germany, and worked as a doctoral student for the German Federal Institute of Occupational Safety and Health. After finishing her PhD in 2010, she was awarded a 2-year postdoctoral research fellowship at Harvard School of Public Health and Liberty Mutual Research Institute for Safety, Boston, USA. Her main topics of work include investigating the effects of long and flexible work hours and shift scheduling on occupational safety, health, and social well-being. In addition to her position in the WTS, Dr. Arlinghaus is a co-founder and board member of the German-speaking WTS sister organization “Arbeitszeitgesellschaft e.V.” since 2012.


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Arne Lowden (3rd Term)

Arne Lowden is Associate Professor, is currently working as a sleep and stress researcher at the Stress Research Institute at Stockholm University in Sweden and at Karolinska Institute. He has studied adaptation to work in shiftwork and adolescence, evaluated self-selected workhours, done experimental studies on night eating and sleep. Lately he studies effects on sleep & recuperation using bright light in working life. He is on the Editorial Board of the Scandinavian Journal of Work, Environment & Health and the Sleep Science Journal.

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Sampsa Puttonen (3rd Term)

Associate professor Sampsa Puttonen is working as a senior researcher at the Finnish Institute of Occupational Health. He is also a principal investigator at the University of Helsinki, FI. He has published about 80 peer-reviewed publications that have focused on psychosocial stress, recovery, sleep, and working times, especially shift work. In addition to working in large-scale epidemiological cohorts, he has broad expertise of laboratory and field studies where his interest has been on disentangling the mechanisms (both individual and organizational) underlying the associations between working times and health. Recently his work has focused upon on applied interventional studies, where the aim has been on changing working time arrangements.


Imelda Wong (3rd Term)

Imelda Wong completed her PhD in the School of Population and Public Health at the University of British Columbia, Canada. Her dissertation focused on the effects of shift work and stress on cardiovascular disease by using an interdisciplinary approach combining health psychology, epidemiology, exercise physiology and occupational hygiene. She completed her post-doctoral fellowship at the Institute for Work and Health, where she used national survey data to continue studying health risks associated with shift work. She is currently a Research Fellow with the US National Institute for Occupational Safety and Health and is expanding her work to include fatigue, work scheduling and risk for motor vehicle crashes. Current projects also include developing and evaluating Fatigue Risk Management systems.


Thomas Kantermann (3rd Term)

Thomas Kantermann studied Biology and Psychology at the University of Bielefeld (DE) and after obtaining his diploma he worked on human brain development at the University of Rostock (DE). He later obtained his PhD at the Ludwig-Maximilians-University Munich (DE) in the field of human chronobiology focussing on health in shift workers and the impact of daylight saving time on sleep and circadian rhythms. He did his postdoc at the University of Surrey (UK) studying cardiovascular risk in Belgian shift-workers. After half a year at the Department for Sleep Medicine at the Charité in Berlin (DE), he joined the Chonobiology Unit at the Groningen Institute for Evolutionary Life Sciences (GELIFES) at the University of Groningen (NL) in the Dutch research consortium OnTime – How to fix a (broken) circadian clock. Thomas is founding member of the International Society for Working Time, founding member of the Daylight Academy (Velux Foundation, CH), and both founding member and scientific director of the urban science project ChronoCity Bad Kissingen (DE). He also is board member of the European COST action Loss of Night Network. In 2016, he finished his Habilitation at the Ludwig-Maximilians-University Munich (DE) and obtained the Venia legendi in Medical Psychology. In 2016 he started his own company 'SynOpus' (located in Germany). Since 2018, Thomas is Professor for health psychology at the University of Applied Sciences for Economics and Management (FOM).

More about Thomas' research at:


Research Gate


FOM Neuss (DE)

Greg Roach (2nd Term)

Greg Roach is an Associate Professor at the Appleton Institute for Behavioural Science, CQUniversity.  Greg has conducted a range of projects in laboratory-, simulator-, and field-based settings.  This research is focussed on the impact of irregular work schedules on the sleep/wake behaviour of shiftworkers; the development of technologies and systems to manage the fatigue risk associated with shiftwork; the mechanisms that control the human sleep/wake system; the effectiveness of split sleep/work schedules for employees in industries that require long hours of duty on consecutive days; the impact of sleep restriction and body clock disruption on a predisposition to develop chronic illnesses such as obesity, diabetes, and cardiovascular disease; and the relationships between training load, sleep patterns, and sports performance in world-class athletes.

Greg's research profiles are available at:


Scopus Author ID: 7005844479

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Hans van Dongen (2nd Term)

Research Professor Hans P.A. Van Dongen, PhD is Director of the Sleep and Performance Research Center at Washington State University Spokane. He is internationally known for his research on cumulative cognitive deficits due to chronic sleep restriction; trait inter-individual differences in vulnerability to fatigue; mathematical modeling of fatigue and cognitive performance; and fatigue risk management. With more than 100 peer-reviewed publications, his work is frequently cited and widely applied in laboratory and operational settings. He has been awarded research funding by the National Institutes of Health, NASA, U.S. Navy, U.S. Air Force, U.S. Army, Federal Motor Carrier Safety Administration, Federal Aviation Administration, Transportation Research Board, Regional Airline Association, and various industry partners.

Sleep and Performance Research Center:

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Co-Opted Board Members and additional functions

Past President Frida Fischer 

Prof. Frida Fischer graduated in Biological Sciences in 1971. Since then she focus her studies on Environmental Health and Ergonomics. Since 1997, she has been a Full Professor at the Department of Environmental Health of the School of Public Health, University of Sao Paulo. Her present studies aim to evaluate night and shiftwork effects associated with chronobiology and psychosocial factors at work.  She has been conducting studies on work injuries and early ageing among night and shiftworkers. Another area of her interest is related with child labor and teens at work. She is Associate Editor of the Journal of Public Health  and member of the International Advisory Board of the Journal of Occupational Health Psychology and she is the head of the scientific committee of the Brazilian Ergonomics Association. Her full CV can be accessed at the Brazilian Research Council.


Past Board Member and Forthcoming Symposium Chair Masaya Takahashi 

Masaya Takahashi, Ph.D. has been studying sleep problems associated with work schedules for over 25 years at National Institute of Occupational Safety and Health, Japan. He serves as member, councilor, or secretary for professional societies including European Sleep Research Society, Sleep Research Society, Integrated Sleep Medicine Society Japan, Japanese Society of Sleep Research, and Japan Society for Occupational Health. He also works as Editorial Board members for Scandinavian Journal of Work, Environment and Health, Industrial Health, International Journal of Workplace Health Management, and IATSS Research.


Website Johannes Gaertner

Mailing List Friedhelm Nachreiner

Working Time Society - Internationale Gesellschaft für Arbeitszeit

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