Gregory began theater as a teenager and never left it. He pursued various training paths, first as an actor and then falling in love with theatrical improvisation (in 2001). Since then, he has participated as an improviser in hundreds of performances and numerous formats. He began his first work as a writer in 2005 for radio, TV, and web, earning various recognitions (including the 2022 Solinas Prize for a serial screenplay). He also works as a stage and musical theater actor, writer (theater shorts, musicals), and director.