The two first studied acting at Chicago's Piven Theatre Workshop in Illinois, which was run by Piven's parents.
Piven played supporting roles in many of Cusack's films, including Say Anything, Grosse Pointe Blank and Runaway Jury, before getting his big break on the hit TV series Entourage and winning an Emmy Award.
"I have always been so proud of my friends' success. I own that proudly because I come by it naturally. I was raised on that spirit of collaboration.
"You start getting into trouble in life when you start comparing and contrasting your life to anyone else's."
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