Robert Knepper (born July 8, 1959) is an American actor who voiced Kronos in the film adaptation of The Sea of Monsters. He was born in Fremont, Ohio, and raised in Maumee (near Toledo). While he was growing up, his mother worked behind the scenes in the props department for a community theater. Her involvement in theater caused Knepper to become interested in a acting. He spent many years working in community theater and high school productions. He attended Northwestern University where he studied drama. He currently resides in Southern California.