Marcus is married to singer/songwriter Bree Olivea Giamatti (Olivea Watson). Together they have three daughters: Ophelia Rosalee (born in 2009), Floralina Delilah (born in 2012), and Magnolia Pearl (born in 2015). An accomplished musician, Giamatti plays
bass guitar in several bands in
Los Angeles, including the alternative folk-rock group Olivea, and the psychedelic jam band Rebel Soul. He is also a session musician and a member of Musicians Local 47. Giamatti tossed the ceremonial first pitch at the
1989 World Series opener, played in
Oakland, California. From 2010–14, he has guest starred on series including
Fringe,
The Closer,
Revenge,
Bones and
NCIS: Los Angeles. He is an associate professor of theatre (tenure track) and head of directing at Temple University in Philadelphia, Pennsylvania, where he teaches acting and directing and regularly directs Temple Theaters productions. ==Filmography==