Kirsten Trayner is a Research Fellow at Glasgow Caledonian University, and Honorary Epidemiologist at Public Health Scotland. Her principal research interests are the epidemiology of drug-related harms (HIV, Hepatitis C (HCV) and overdose) and harm reduction interventions and policy that can be implemented to improve the health and wellbeing of people who use drugs.

Marie Jauffret-Roustide is a Sociologist, Research Fellow at the French National Institute of Health and Medical Research. She supervised an international research program on harm reduction policies in different settings focusing on the evaluation of drug consumption rooms and community-based project on gender, migration and stigma in access to care.

Daliah Heller, PhD, MPH, is a public health practitioner who has worked for three decades to implement harm reduction strategies at systems and community levels. She is Vice President of Drug Use Initiatives at Vital Strategies, and previously served as a NYC government official and a community harm reduction leader.

George Kalamitsis is a founding member and Chair of Hellenic Liver Patients Association "Prometheus" since 2012 and a founding member and General Secretary of Greek Patients Association. He is engaged in national and international health policy, specialized in the public health sector. His work is related to providing support to people living with liver diseases, advocating for their rights and providing evidence-based policy actions. Recently, he was assigned as Member of the Central Board of Health (2019) and as President of the Committee Protecting the Rights of Recipients of Health Services (Greek Ministry of Health 2017). In 2014 he was elected board member of the world Hepatitis Alliance. He founding member and first president of Liver Patients International (LPI). He has been working extensively with multiple stakeholders, focusing on patients’ rights as well as building communication channels with organizations and stakeholders, on a National and International level.

Marios Atzemis was born in Athens on the 6th December 1974. He graduated from Athens College in 1992 and from the American College of Greece in 2003 with a bachelor in Sociology. He was a user of psychoactive substances for many years. Marios was one of the many people who were recorded in the collective consciousness as a case of the HIV outbreak among injecting drug users in the centre of Athens between 2011-2013From the summer of 2014 up to the summer of 2024 ,Marios worked at the Greek Association of PLHIV ‘’;POSITIVE VOICE’’ as a harm reduction officer. Since 2016, he has been a regular member of the European AIDS Treatment Group and represented it from 2019 until 2024 in the Civil Society Forum on Drugs( official consultative body of the EU and the Commission regarding drug policies and Civil Society)He represented the national Greek delegation for numerous times in the UN convention regarding drugs (United Nations Office of Drugs and Crime - Committee on Narcotic Drugs)He is also a board member of the Drug Policy Network of South East Europe (DPNSEE)And an an advisory committee member of Correlation European Harm Reduction Network Currently he is the deputy chair of Addiction Prevention Centers ATHENA HYGEIA and an advisor to the Mayor for drug policies and bloodborne infections

Sharon is a Professor of Epidemiology and Population Health at Glasgow Caledonian University and Honorary Consultant with Public Health Scotland. Her epidemiological research (involving population-based surveys, novel record-linkage studies, and statistical/economic models) focusses on the evaluation of interventions to prevent blood-borne viruses and related harms among people who inject drugs.

Vana Sypsa is Professor of Epidemiology and Medical Statistics in the National and Kapodistrian University of Athens in Greece. Her research interests include the epidemiology of hepatitis C, HIV and other infectious diseases. She is principal investigator in community-based programs for PWID in Greece.