He received his Ph.D. in Social-Organizational Psychology from Columbia University in New York in 2008. Prior to joining HEC Paris in 2009, Mathis was a senior fellow at the Wharton School, University of Pennsylvania, in Philadelphia, and lectured on Negotiations and Conflict Resolution. His research focuses on organizational climate and social networks on team and organizational effectiveness. He is the co-director of the joint executive master’s program ‘Consulting and Coaching for Change’ of Said Business School, Oxford, and HEC Paris.