Mackenzie Alexander Astin (born May 12, 1973) is an American actor. Astin was born on May 12, 1973, in Los Angeles, California, the son of actress Patty Duke and actor John Astin. His older half brother is actor Sean Astin. He attended Ralph Waldo Emerson Middle School and University High School in Los Angeles. He is married to Jennifer Abbott Astin (nee Bautz).