During his career in the theater, begun in 1981, he has worked with names of the caliber of Sergio Castellitto (joined by Margaret Mazzantini), Sergio Rubini, Giorgio Albertazzi, Fiorenzo Fiorentini, Renzo Montagnani and Ennio Fantastichini. Voiced by the late eighties, he has given voice to some interpretations appreciated performers of European cinema, as Gérard Depardieu or Rüdiger Vogler, in Lisbon Story by Wim Wenders, and American as Harvey Keitel, James Caan, Billy Bob Thornton, Alfred Molina, Ben Kingsley, Dennis Hopper, Christopher Walken and Willem Dafoe. He also voiced Marlon Brando in Apocalypse Now Redux, Patrick Stewart in the movie franchise X-Men and Hugo Weaving in "The Matrix" trilogy. He has appeared as an actor in "Li chiamarono... briganti!" by Pasquale Squitieri, in "Caruso; Hannibal", directed by Ridley Scott; in "Una storia italiana", directed by Stefano Reali in the role of father of the Abbagnale brothers. For television, Coltorti has doubled Lance Henriksen as Frank Black in "Millennium", Ron Rifkin in the role of Arvin Sloane on "Alias" and Ted Levine in the role of Leland Stottlemeyer in "Detective Monk". He participated as an actor in the drama "Lui e lei". He is the creator and director of the theatrical "Attori in cerca d'autore".