Won a high school playwriting contest earning a ticket to Orson Welles' Mercury Theatre; sold Welles his play "The Mechanical Rat" at age 15
Joined the US Air Corps and served as an officer
Studied at Yale Drama School and the American Theatre Wing after World War II
Had his Off-Broadway debut with "Bullfight"
Had a successful Broadway run with the romantic comedy "Marriage-Go-Round", starring Charles Boyer and Claudette Colbert
Wrote, co-produced and directed his first film "Private Property"; met his first wife Kate Manx
Wrote the Paul Newman Western drama "The Left-Handed Gun"
Adapted his play "Marriage-Go-Round" into a film starring Susan Hayward and James Mason
Worked as executive producer on the NBC Western "The Virginian"
Wrote the action film "Heroes Island" starring James Mason
Co-created, directed, wrote and produced the sci-fi anthology TV series "The Outer Limits" (ABC)
Directed and wrote the horror film "Incubus", featuring Esperanto dialogue
Produced and wrote the Robert Wagner adventure series "It Takes A Thief" (ABC)
Produced and wrote "Name of the Game" (NBC), a crime-drama series with Gene Barry and Tony Franciosa
Produced and wrote NBC's "McCloud" starring Dennis Weaver
Produced and wrote the NBC movie "Search" and its subsequent series
Produced and wrote the TV-movie "The Gemini Man" (NBC) and its subsequent sci-fi adventure series
Produced and wrote the mystery TV-movie "Stonestreet: Who Killed the Centerfold Model?" (NBC)
Was surpervising producer on the ABC sci-fi adventure series "Battlestar Galactica"
Wrote the film "Buck Rogers in the 25th Century" and acted as supervising producer on the 1979-1980 NBC TV series
Formed Empress Productions with Los Angeles Rams owner Georgia Frontiere, producing plays for the John F Kennedy Center for the Performing Arts in Washington, DC
Wrote the jungle queen film "Sheena" starring Tanya Roberts
Was supervising producer on NBC's action adventure series "The Highwayman"
Established the Leslie Stevens Fellowships for Television Writing to encourage new talent
Wrote the film "Return to the Blue Lagoon"
Was a program consultant on Showtime's new version of "The Outer Limits"
Produced and wrote the family comedy feature "Gordy"
Produced and wrote the syndicated TV-movie "Tarzan's Return"