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 2021-24

Registered members of the WTS can send the board a message via wts2-board(at)

President Stephen Popkin (2nd 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 (2nd 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 2023, and board member of the Brazilian Sleep Society. Her research profiles are available at:


Scopus Author ID: 7202594197

Treasurer: Anna Arlinghaus (3rd 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.


Google Scholar:

Greg Roach (3rd 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

Google Scholar:

Phil Bohle (2nd Term)

Anne Helene Garde (2nd Term)

Kimberly Honn (1st Term)

Elaine Marqueze (1st Term)

Kyriaki Papantoniou (1st Term)

Mikael Sallinen (1st Term)

Céline Vetter (1st Term)

Co-Opted Board Members and additional functions

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

c/o Assoc. Prof. Dr. Johannes Gärtner, Vienna University of Technology - Institute 193-04, Favoritenstrasse 9-11 - A-1040 Vienna
Informationen gemäß/according to  E-Commerce-Gesetz Art. 1 § 5. Privacy Notice

Powered by Wild Apricot Membership Software