As a French Doctor in general practice; PhD in Social Epidemiology, and Professor at Sorbonne University, Jean Sébastien Cadwallader is a member of the ASU-GHI board.

He has worked as a general practitioner at the Aubervilliers Health Center since 2011 and coordinates research on social inequalities in health with the city's public health department. He completed his doctoral studies in INSERM Unit 1178 (Director: Bruno Falissard), where he focused on eating disorders.

He teaches qualitative research methods in healthcare, having trained at the Universities of Antwerp and Maastricht, and has been the deputy editor-in-chief of Exercer, the French journal of general practice, since 2013. He is also a member of GROUM-F, the qualitative branch of the CNGE (National College of General Practitioner Teachers), and has authored several books on qualitative research.

He conducts qualitative health research on patients in precarious situations. He works within ESSMA (Social Epidemiology and Addictions) and the INsPA in conjunction with the Institute of Global Health.