Demian holds a law degree (2011) and a specialisation diploma in Administrative Law and Public Administration (2016) from the University of Buenos Aires. In 2021 he was awarded a European Research Council PhD scholarship from the Sutherland School of Law, UCD.

From 2016 to 2020 he worked as a Complaint Channel Coordinator and an Advisor to the Head of the Anti-Corruption Office in Argentina. His professional background includes the implementation of public policies on integrity, transparency and whistleblower protection policies and procedures. His professional experience also featured teaching Constitutional and Administrative Law at the University of Buenos Aires and the National University José C. Paz in Argentina, and he was an Assistant Professor of Professional Practice for the Legal Clinic of the NGO Civil Association for Equality and Justice (ACIJ). Demian has published on topics relating to the Council of the Judiciary, institutional strengthening and transparency in public-decision-making, freedom of speech, access to public information, and human rights. His research interests are focused on democratic institutions and their relation to human rights, public law, accountability and political corruption.