Christopher Eugene O'Donnell is an American actor. 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.