Holt McCallany is an American actor best known for his roles in the television series Freedom (2000-2001), CSI: Miami (2003-2005) and Heroes, in 2007.
He also starred on the FX series Lights Out in which he played a boxer with pugilistic dementia, in 2011; and has a starring role as as homicide detective Joe Diaco in the police procedural television series Golden Boy.
He has appeared in numerous films such as Men of Honor, Three Kings, Fight Club, Below, Vantage Point, and The Losers, among others.
On television he played a detective with psychological problems who commits suicide on CSI Miami, and a soldier with post-traumatic stress disorder on Criminal Minds.
Holt was born in New York City to a theatrical family. His mother was an actress/singer and his father was an actor/producer. He began school in Dublin, Ireland, at the age of five, but returned to the United States following his parents' divorce.
When he was 14 years old he ran away from home and took a Greyhound bus to Los Angeles to pursue his dream of becoming an actor, but his parents tracked him down and sent him back to Ireland to boarding school.
After high school, Holt went to France to continue his education. He learned French at the Sorbonne; studied art history at the Paris American Academy; and theatre at L'Ecole Marceau and L'Ecole Jacques Lecoq.
He spent a summer studying Shakespeare in Oxford, and went with a production of Twelfth Night to the Edinburgh Fringe Festival in Scotland.
After Europe, he moved back to New York City to begin his professional acting career.