He is a historian and professor of history and citizenship education at the University of Geneva. His work focuses on the history of the labour movement, the teaching and learning of history, questions of memory, museography and the history of education. His teaching focuses in particular on teacher training. Since 2015 he has been editor of the research blog A School of Clio. History and didactics of history, which deals with aspects of history teaching. He also collaborates on history and memory work with the historical sites and museums of the Resistance, the Deportation and the Occupation period in the departments of Haute-Savoie and Ain.