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He has performed in over 50 plays including Solzhenitsyn, For Those in the Peril on the Sea, Sandinista, Nineteen Eighty-Four, La Storia Calvino, A Flea in Her Ear and The Lesson. His movie roles have included Caffè Italia, Concrete Angels, La Sarrasine, An Imaginary Tale, La Déroute and My Father's Angel, and his TV credits have included Rossini's Ghost, Galileo: On the Shoulders of Giants, Bonanno: A Godfather's Story, Almost America, Il Duce Canadese and Indian Summer: The Oka Crisis.
Nardi is a two-time winner of the Genie Award for Best Actor for his roles in La Sarrasine and My Father's Angel, and a winner of the Dora Mavor Moore Award for Performance by a Male in a Principal Role – Play for his role in The Lesson. He has been nominated for both Genie and Dora awards for other roles.
Nardi is co-author with Vincent Ierfino of the play La Storia dell'Emigrante. Written in Calabrian, English and French, the play was the first in Canada (on record) written by an Italian-Canadian and addressing an Italian-Canadian reality. In 1982 La Storia dell'Emigrante received the first James Buller Award for best original Canadian play at the Ontario Multicultural Theatre Festival.
Nardi's second play A Modo Suo: A Fable, written in Calabrian in 1990, received a Dora Award nomination for Best Play. An English translation was published in its entirety in the Canadian Theatre Review in 2000.
Two Letters (2006), two theatrical monologues based on two actual letters sent to a film/television producer and two theatre critics, received a 2007 Dora Award Nomination for Outstanding New Play.