Óscar Contreras Hernández is an Associate Professor at the Faculty of Social Sciences at the University of Castilla-La Mancha. A specialist in European Social Law, European integration, and employment policies, he has focused his research on comparative labour law, worker mobility, and social protection.

He holds a Doctorate in Law with International Mention and an Extraordinary Award and has conducted research stays at the Pontifícia Universidade Católica de São Paulo and the Universidade Nova de Lisboa. His professional career also includes experience as a labour lawyer and as an arbitrator in union elections.