Olivier de Hon:

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Olivier de Hon is scientific manager of the official National Anti-Doping Organisation of the Netherlands: ‘Dopingautoriteit’. Besides his everyday dealings with doping issues, his former scientific projects include: the prevalence of doping use, effectiveness of anti-doping policies, determinants of doping use in elite athletes and visitors of fitness centres, gene doping, and the quality of illegal doping substances. He is an advisor to the polyclinic for users of anabolic steroids at Haarlem, the Netherlands, and member of the advisory board of the “Informed Sport” program (UK based nutritional supplements testing scheme). He is a volunteer guide of the Olympic Stadium in Amsterdam, the Netherlands. Email Olivier:

You can also find him on LinkedIn.

Rosa Koenraadt, PhD


Dr Rosa Koenraadt works as an assistant professor of criminology at the Institute of Criminal Law and Criminology since 2018. After obtaining her bachelor’s degree in Psychology at the University of Amsterdam and her master’s degree in Criminology at Utrecht University, she worked as a researcher and lecturer at the Willem Pompe Institute of Utrecht University. From 2013-2017 she conducted her PhD study within the Doctorate in Cultural and Global Criminology (DCGC) programme on the illicit pharmaceutical trade in the Netherlands and China. Email Rosa:

You can also find her on Twitter:@KoenraadtRosa, Academia: and LinkedIn.

Willem Koert:

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In the nineties, working as a sociologist, Willem Koert published ethnographic studies on the Dutch bodybuilding scene and the black market for anabolic steroids in the Netherlands. Since 1999 he has been working as a freelance investigating journalist, science writer and independent consultant with a special interest in legal and illegal body recompositioning technologies. His articles have appeared in health and fitness magazines and Dutch national newspapers. He initiated and, newsletters on resistance training, nutrition, fitness, longevity and performance enhancing drugs. E-mail Willem:

You can also follow him on TwitterLinkedIn, and

Katinka van de Ven, Ph.D.


Katinka van de Ven, Ph.D., holds a M.Sc. in Psychology and a M.A. in Criminology from the Utrecht University. Her Ph.D. focused on the production, distribution and use of anabolic-androgenic steroids and other image enhancing drugs in Belgium and the Netherlands. For this research, she received the Research Prize Award from the University of Kent in 2016. She currently works as a Research Fellow at the National Drug and Alcohol Research Centre (NDARC) at the University of New South Wales. In addition, she in collaboration with her colleague Kyle Mulrooney created the Human Enhancement Drug Network ( The goal of the network and website is to provide evidence-based information, to share knowledge and experience, to provide harm reduction and human enhancement drug (HED) education, and to collaborate in this growing field of HEDs. Her research interests are in the field of HEDs, drug use and supply, harm reduction, drug policy, anti-doping, health, nutrition and sports. Outside of her academic career, Van de Ven is also highly active in Crossfit, both as a trainer and coach, and bodybuilding, and in her spare time advises clients on nutrition and supplements. Email Katinka:

You can also find her on Twitter: @KatinkavandeVen, Academia:, and LinkedIn:

Alvin Westmaas:

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Alvin Westmaas is a Ph.D. researcher associated with Maastricht University and an Assistant Professor at the University of Amsterdam. As a mixed-method researcher, he has a strong preference for conducting research within difficult to reach populations in order to identify and understand the mechanisms related to taboo-related behaviors. During his Ph.D. trajectory, he spent time researching migrant populations in the Netherlands by means of a spiral approach research. Alvin Westmaas is also known for his expertise in culturally based and culturally sensitive research, focusing on both the positive, unique and negative beliefs within a community. Lastly, he was involved in different studies for developing/identifying a common language between healthcare providers and the research population. At the moment, Alvin is working on research, which integrates both social and health psychology by means of the Intervention Mapping protocol. His work focuses on understanding the mechanisms in motivation of recreational gym users and competitive athletes for using performance and image enhancing drugs (PIEDs). Also, he is focusing on the experienced stigma of, and the attitude from the social environment towards gym users and performance and image enhancing drug users. As he is a competitive fitness athlete himself, he has easier access to the research population and is closer to the influencing factors of sports. Email Alvin:

You can also find him on Twitter: @ah_westmaas, ResearchGate, and LinkedIn.