She is an Emeritus Research Director at the National Center for Scientific Research (CNRS) in Paris.
Cassin is a program Director at the International College of Philosophy and the director of its Scientific Council and member of its Board of Directors.
She was a director of Collège international de philosophie established by Jacques Derrida.
In 2006 she succeeded Jonathan Barnes to the directorship of the leading centre of excellence in Ancient philosophy, Centre Leon-Robin, at the Sorbonne.
In recent years she has been teaching seminars and writing books in partnership with Alain Badiou.