He has been President of the Constitutional Court of Italy since 24 February 2016. He has served on the Court since 23 February 2009. He was a law professor before he was appointed to the Constitutional Court by the President of Italy, Giorgio Napolitano, on 17 February 2009.
Grossi was sworn in on 23 February 2009.
At the University of Florence he worked as a professor of History of Medieval and Modern Law.