Christopher Eugene O'Donnell (born June 26, 1970) is an American actor and former model. He played Charlie Simms in Scent of a Woman, D'Artagnan in The Three Musketeers, Jack Foley in the drama film Circle of Friends, Dick Grayson/Robin in Batman Forever and Batman & Robin, Jason Brown in Robert Altman's Cookie's Fortune, and Peter Garrett in Vertical Limit. O'Donnell currently stars as special Agent G. Callen on the CBS crime drama television series NCIS: Los Angeles, a spin-off of NCIS. Christopher O'Donnell was born in Winnetka, Illinois, the son of William Charles O'Donnell, Sr., a general manager of WBBM-AM, and Julie Ann Rohs von Brecht. He is the youngest of seven children, with four sisters and two brothers, and is of German and Irish descent. He was raised in a Roman Catholic family and attended Roman Catholic schools, including Loyola Academy in Wilmette, Illinois for high school, graduating in 1988. He attended Boston College and graduated with a Bachelor of Science in marketing. He began modeling at the age of 13, and was featured in several commercials. O'Donnell is married to Caroline Fentress. They have five children. O'Donnell is a practicing Roman Catholic.

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