2000

… Writer

1994

… Writer

1986		Secrets of the Titanic … Writer
1986		Realm of the Alligator … Writer

1980

… Writer

1974

… Writer

1968

… Writer

1966

… Dialogue

1999

… Executive Producer

1998

… Executive Producer

1997

… Executive Producer

1996		Okavango: Africa's Wild Oasis … Executive Producer
1996		Inside the White House … Executive Producer

1995		30 Years of National Geographic Specials … Executive Producer
1995		National Geographic - Arctic Kingdom: Life at the Edge … Executive Producer

1994

… Executive Producer

1993

… Executive Producer

1972

… Executive Producer

1968

… Producer

1998

as Narrator

1974

… Director