Also meet our Educators, Board of Directors, and Administrators.

D J Williams, Director of ResearchD J Williams, PhD
Director of Research/Co-Founder Journal of Positive Sexuality

D J Williams is the Director of Research for the Center for Positive Sexuality and a social and behavioral scientist at Idaho State University. He completed doctoral and postdoctoral studies at the University of Alberta (Canada), and his scholarship intersects leisure science, forensic behavioral science, criminology, and sexology. D J is a leading international expert on deviance as leisure experience, and he has been a consultant and/or expert witness on several high-profile forensic cases involving sexuality and actual or potential violence. His research has been published in numerous academic books and journals, including Journal of Sexual Medicine, Homicide Studies, Deviant Behavior, Journal of Forensic Sciences, Leisure Sciences, and Critical Criminology. D J can be reached by email at
Kassandra McFarland Research CoordinatorKassandra McFarland, MA
Research Coordinator

Kassandra McFarland is the Center for Positive Sexuality’s research coordinator and also a graduate student of anthropology at Idaho State University. Her research interests include sex positive sex education, polyamory, sexual attitudes, human sexual biology and sexual diversity around the world. Her current research is focused on sex education, sexual attitudes and utilizing anthropology’s bio-cultural approach. Kassandra can be reached at
Liza Berdychevsky, Research AffiliateLiza Berdychevsky, PhD
Research Affiliate

Dr. Liza Berdychevsky is an associate professor in the Department of Recreation, Sport and Tourism at the University of Illinois at Urbana-Champaign. She graduated from the University of Florida with a Ph.D. in Health and Human Performance and from Ben-Gurion University of the Negev, Israel, with an M.B.A. in Business Administration. Dr. Berdychevsky’s research revolves at the nexus of sexual health and wellbeing in leisure and tourism contexts, adopting a gender-sensitive and a life course-grounded approach. She uses a variety of methodologies in her projects, including quantitative, qualitative, and mixed methods. Overall, Dr. Berdychevsky’s research contributes to a deeper understanding of the issues associated with sexual health and violence and offers directions for health education programs and prevention and intervention methods. She has published in several leading academic leisure, tourism, and sexuality journals and presented her work at numerous national and international congresses. She serves as a consulting editor on The Journal of Sex Research, an associate editor on Leisure Sciences, and an editorial advisory board member on the Annals of Leisure Research.
Moshoula Capous-Desyllas, PhD Research AffiliateMoshoula Capous-Desyllas, PhD
Research Affiliate

Moshoula Capous-Desyllas is an Associate Professor in the Sociology Department at California State University Northridge. She is an arts-based researcher committed to participating in anti-oppressive and decolonizing research practices, as well as engaging in social justice issues related to gender, sex and sexuality through art. Her passion lies in highlighting the voices of marginalized communities through the use of art as a form of activism, empowerment, and social change. Moshoula has facilitated numerous community-based, photovoice research projects within various communities and collectives, including sex workers, participants of gay rodeo, LGBTQ former foster care youth, and LGBTQ+ refugees and asylum seekers living in Athens, Greece.
M. Candace Christensen, Research AffiliateM. Candace Christensen, PhD
Research Affiliate

M. Candace Christensen is an Assistant Professor of Social Work at the University of Texas San Antonio. Candace’s research centers on using feminist and arts-based research methods to address gender-based violence (GBV) on college campuses. Candace was awarded the Feminist Manuscript Scholarship Award for 2013 from the Council on Social Work Education. Candace’s most recent research examines the use of photovoice as a tool to prevent and respond to GBV.
Dr. Dave Holmes, Research AffiliateDave Holmes, PhD
Research Affiliate

Dr. Dave Holmes is Professor and University Research Chair in Forensic Nursing. Distinguished Leader, American Academy of Nursing. After completing his B.Sc. (Ottawa, 1991), M.Sc. (Montreal, 1998) and Ph.D. (Montreal, 2002) in Nursing, Professor Holmes completed a CIHR post-doctoral fellowship in Health Care, Technology and Place at the University of Toronto, Faculty of Social Work (2003). To date, Dr. Holmes received funding, as principal investigator, from CIHR and SSHRC, to conduct his research program on risk management in the fields of Public Health and Forensic Nursing. With regard to sexuality, he has conducted research is the fields of barebacking, BDSM, and public sex. Most of his work, comments, essays, analyses and research are based on the poststructuralist works of Deleuze & Guattari and Michel Foucault. His works have been published in top-tier journals in nursing, criminology, sociology and medicine. He was appointed as Honorary Visiting Professor in Australia, Indonesia, the United States, and the United Kingdom.
Emily Prior, Executive Director, Research AffiliateEmily E. Prior, MA
Research Affiliate/Co-Founder Journal of Positive Sexuality

Emily E. Prior is the Executive Director for the Center for Positive Sexuality. Since 1996 she has been teaching formal and informal classes about a variety of sexuality-related topics including Gender, Deviance, Relationships and Family, and Feminism. She is an adjunct professor at several colleges and universities, has over a dozen publications, and presents at conferences around the U.S. She is frequently interviewed about her research, the Center, and positive sexuality in general. She also won the Vern Bullough Award for research. Her research focuses on the intersections of identity, feminism, deviance, leisure, gender, and sexuality.
Brad Sagarin, Research AffiliateBrad Sagarin, PhD
Research Affiliate

Dr. Brad Sagarin is a professor of social and evolutionary psychology at Northern Illinois University and the head of the Science of BDSM Research Team ( Brad's current research focuses on consensual BDSM, social influence, and statistics. Brad has been published in a variety of scholarly journals, has given radio and podcast interviews, has consulted for radio and television programs, and has delivered invited lectures to academic and non-academic organizations. His research has been cited in newspapers and magazines, including The Economist and New Scientist. He holds Doctorate and Master's degrees in Social Psychology from Arizona State University, and a Baccalaureate degree in Computer Science from the Massachusetts Institute of Technology.
Elisabeth "Eli" Sheff, Research AffiliateElisabeth "Eli" Sheff, PhD
Research Affiliate

Dr. Elisabeth “Eli” Sheff is the foremost academic expert on polyamorous families with children. Sheff’s first book, The Polyamorists Next Door (2014), details her 15-year study of poly families with kids and was just reprinted in paperback, and her second book Stories from the Polycule (2015) is an edited anthology of writings by poly folks. When Someone You Love is Polyamorous (2016) is Sheff’s shortest book that guides family members and significant others who are trying to understand a polyamorous loved one. Dr. Sheff is currently in her fourth wave of data collection for her 20+ year study of polyamorous families with children.
Richard Sprott, Research AffiliateRichard Sprott, PhD
Research Affiliate

Dr. Richard Sprott received his Ph.D. in Developmental Psychology from UC Berkeley in 1994. He researches identity development and health/well-being in people who express alternative sexualities and non-traditional relationships, with a special emphasis on kink/BDSM sexuality, and polyamory or consensual non-monogamy. All of these efforts highlight the ways in which stigma, prejudice, minority dynamics, language, identity development and community development all intersect and affect each other. Richard currently teaches courses in the Department of Human Development and Women's Studies at California State University, East Bay and graduate and undergraduate level courses at various universities in the Bay Area, including UC Berkeley, the California Institute of Integral Studies, and Holy Names University. He can be reached via email at
Jeremy Thomas, Research AffiliateJeremy N. Thomas, PhD
Research Affiliate

Dr. Jeremy N. Thomas is the Director of Gender and Sexuality Studies and Associate Professor of Sociology in the Department of Sociology, Social Work, and Criminology at Idaho State University. He received his Ph.D. from Purdue University. Dr. Thomas’ research focuses on sexuality, deviance, and the body. He is especially interested in experiences, meanings, and identities related to: pornography and sex work; BDSM, kink, and fetish sexuality; sexual consent, abuse, assault, rape, and murder; and body modification, ritual violence, and self-injury. You can follow his research at
Liam Wignall, PhD, Research AffiliateLiam Wignall, PhD
Research Affiliate

Dr. Liam Wignall is a lecturer in Psychology at Bournemouth University. Using qualitative research methods, he explores the identities and experiences of non-heterosexual individuals related to: kink, BDSM, and fetishes; pornography consumption; drag subcultures; non-exclusive sexualities; and sexual consent. He draws on theories from psychology, sociology and cultural studies, focusing on the impact of the internet and the role of community participation for these individuals. He is a member of the International Academy of Sex Researchers and serves on the British Psychological Society's Psychology of Sexualities committee. Dr. Wignall can be contacted at
Ryan Witherspoon, Research Affiliate Ryan G. Witherspoon, PhD
Research Affiliate

Dr. Ryan G. Witherspoon is a clinician, researcher, educator and speaker. He received his Ph.D. in Clinical Psychology from the California School of Professional Psychology (CSPP) at Alliant International University, and holds Masters degrees in clinical and general psychology from CSPP and Pepperdine University, respectively. As a clinician, he focuses primarily on practicing psychoanalytic psychotherapy with adults and relationships, as well as working with non-traditional relationships and sexualities such as consensual non-monogamy, polyamory, and kink. Ryan frequently publishes and presents on these and other topics to professional and general audiences, as well as trains clinicians in cultural competence and sex-positivity regarding alternative sexualities and relationships. His current research focuses on the intersections between consensual non-monogamy, stigma, minority stress, and resilience.
Daniel Copulsky, Board Member, Educator, Research AssistantDaniel Copulsky
Research Affiliate/Educator/Board Member

Daniel Copulskyis a graduate student in Social Psychology at the University of California, Santa Cruz. His research focuses on marginalized sexualities and relationships, particularly LGBTQ+ and non-monogamous identities. He speaks regularly at colleges and conferences, including presentations at the Alternative Sexualities Conference, Positive Sexuality Conference, and Alt Sex NYC.
Skye Williams, Director of Human ResourcesCielle "Skye" Williams
Research Assistant/Internship Director

Cielle "Skye Williams is the Internship Director for the Center. She is a college graduate with a bachelor's of science in Captive Wildlife Care and Education and a minor in Psychology. She has also been a guest on the Center’s show “Is This Normal?” as an advocate for furries and people in relationships with transgenders. She has presented on the differences between furries and zoophiles at several national conferences.
Maria O'Brien, Research AssistantMaria O’Brien is an undergraduate student at William Paterson University in Wayne, NJ. She is a triple major in Psychology, Women’s and Gender Studies, and Elementary Education, with an endorsement in Teaching Students with Disabilities. She is currently working to complete her student teaching in a fourth grade classroom, and is the laboratory manager at Baruch College’s Social Psychology Laboratory in New York City. Last year, Maria completed a Research Experiences for Undergraduates fellowship in Baruch College’s Social Psychology Laboratory studying the effects that mortality salience has on helping behavior, and a research internship for the Center for Positive Sexuality.

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