"Gravity Storm" is the sixth episode of the second season of the 1970s American television series "Land of the Lost".
 Written by Dick Morgan and directed by Gordon Wiles, it first aired in the United States on October 11, 1975 on NBC.
 Marvin Miller guest-starred as the Zarn.
Gordon Wiles (October 10, 1904 – October 17, 1950) was an American art director and film director.
 He won an Academy Award for Best Art Direction for the film "Transatlantic".
 He was born in St. Louis, Missouri.
 His father, Albert Wiles, was a doctor in Jerseyville, Illinois.
The Gangster (aka Low Company) is a 1947 American crime film noir directed by Gordon Wiles.
 The drama features Barry Sullivan, Belita, Joan Lorring and Akim Tamiroff.
 The screenplay was written by Daniel Fuchs, based on his novel "Low Company" (1937).
Stephen Robert Herek (born November 10, 1958) is an American film director.
"The Longest Day" is the seventh episode of the second season of the 1970s American television series "Land of the Lost".
 Written by Joyce Perry and directed by Gordon Wiles, it first aired in the United States on October 18, 1975 on NBC.
Mr. Boggs Steps Out is a 1938 American romantic comedy film directed by Gordon Wiles.
"One of Our Pylons Is Missing" is the fourth episode of the second season of the 1970s American television series "Land of the Lost".
 Written by Bill Keenan and directed by Gordon Wiles, it first aired in the United States on September 27, 1975 on NBC.
"Tar Pit" is the first episode of the second season of the 1975 American television series "Land of the Lost".
 Written by Margaret Armen and directed by Gordon Wiles, it first aired in the United States on September 6, 1975 on NBC.
Prison Train is a 1938 American crime drama film directed by Gordon Wiles.
 Released by Equity Pictures Corporation, the film stars Fred Keating and Dorothy Comingore (billed as Linda Winters).
 Burlesque dancer Faith Bacon also appears in the film.
 It was her first and last film role.
Two-Fisted Gentleman is a 1936 American drama film directed by Gordon Wiles and starring James Dunn, June Clayworth and George McKay.

Question: Gordon Wiles and Stephen Herek, share which mutual occupation?
Answer: film director