He is the author of several books, articles and lectures pertaining to social and political philosophy, epistemology and critical theory, and the sociology of culture and intellectual life; with a particular interest in the work of Pierre Bourdieu and Michel Foucault.

His work largely pertains to social and political philosophy,[6][7][8] epistemology and critical theory,[9][10][11] as well as the sociology of cultural and intellectual life.

The book focused on the role of whistleblowers, particularly Edward Snowden, Julian Assange, and Chelsea Manning, in maintaining and strengthening democracy.

It also includes reflections on the methodology of sociology: in the last chapter, Lagasnerie argues that ethnography is an inherently "conservative" framework for understanding society.

[24] De Lagasnerie co-wrote a book with Assa Traoré on the fight against state violence and police brutality.

[25] In his book La Conscience Politique, he argues for a more realist political theory, one that fully acknowledges that state violence is the one thing in one's life that one can never escape.