From Wikipedia, the free encyclopedia. Mike Horner (born February 3, 1955) is an American pornographic actor. He is sometimes credited as Don Hart, Don Horner, "Dan Sir", or Johnny Wilson. Mike Horner began acting in small sex films, at the time referred to as loops (named after the style of their presentation, constantly looped 16mm films shown in booths), in January 1978. His first feature movie was 1979's Tangerine. He has been in over 1500 feature (story based) films and videos, and perfor...