Christian Slater net worth: Christian Slater is an an American actor and voice-over artist who has a net worth of $40 million. Christian Slater was born Christian Michael Leonard Slater on August 18, 1969. He earned his net worth by acting many films and television shows over an acting career that has lasted nearly three decades. Born in New York, New York, Slater comes from a family of actors. Slater has voice acted for the character John Watson on The Hitchhiker's Guide to the Galaxy television series among many others.