 In connection with his work on prison and punishment, Fassin was invited in 2018 to join the New Jersey Criminal Sentencing and Disposition Commission, which has been appointed by the Governor of the State to make recommendations about the penal and corrections system, as Guest Advisor.Apart from his academic career, Fassin has been involved in various solidarity non-governmental organizations in France.In 1996 he founded the Medico-social Unit Villermé at the Hospital Avicenne to provide health care to uninsured and undocumented patients.