Biography
Andrew Mackin is an actor and casting professional. He played John O'Shea in the 2003 film Mystic River.
Mackin also appeared as a Frat Guy in a 2009 episode of the television series Grey's Anatomy and as Christopher Columbus in the 2015 short film Christopher Columbus Saves the World. He has worked in the casting department on numerous films and series, including Lone Survivor (2013).
