Question: What occupation was shared by both Tom Buckingham and George Sherman?

Context paragraphs:
Wild Horse Rodeo: Wild Horse Rodeo is a 1937 American Western film directed by George Sherman and starring Robert Livingston, Ray Corrigan, and Max Terhune.  Written by Oliver Drake and Betty Burbridge, based on a story by Drake and Gilbert Wright, the film is about a champion rodeo rider who returns to his home town in search of a legendary wild horse called Cyclone.  The film is part of the "Three Mesquiteers" series of B-movies produced by Republic Pictures.  "Wild Horse Rodeo" was the first film directed by George Sherman, who later directed numerous Western films for Republic, Columbia Pictures, and Universal Pictures.

The Cyclone Rider: The Cyclone Rider is a 1924 American silent adventure film directed by Tom Buckingham.  Prints of the film survive in the Czech Film Archive.

The Painted Desert: The Painted Desert is a 1931 American pre-Code film released by Pathé Exchange.  Produced by E. B. Derr, it was directed by Howard Higgin, who also co-wrote the screenplay with Tom Buckingham.  It starred low-budget Western stars William Boyd (in his pre-Hopalong Cassidy days) and Helen Twelvetrees, and featured a young Clark Gable in his talking film debut.  The picture was shot mostly on location in Arizona.

What Price Beauty?: What Price Beauty?  is a 1925 American silent drama film directed by Tom Buckingham and starring Nita Naldi, Natacha Rambova and Pierre Gendron.  The film featured the future star Myrna Loy in a small role.  Her performance attracted widespread interest, boosting her career.

Tom Buckingham: Tom Buckingham (February 25, 1895 – September 7, 1934) was an American film director and screenwriter.  He directed 48 films between 1920 and 1932.  He was born in Chicago, Illinois, and died from surgical complications.

Ladies of Leisure (1926 film): Ladies of Leisure is a 1926 silent film melodrama produced and distributed by Columbia Pictures.  It was directed by Tom Buckingham and starred Elaine Hammerstein.

George Sherman: George Sherman (July 14, 1908 – March 15, 1991) was an American film director and producer of low-budget Western films.

Forbidden Cargo (1925 film): Forbidden Cargo is a 1925 American drama film directed by Tom Buckingham and featuring Boris Karloff.  The film is considered to be lost.

Arizona Express: Arizona Express is a 1924 American silent drama film directed by Tom Buckingham and starring Evelyn Brent.  Prints of the film survive in the Museum of Modern Art.

Destination Unknown (film): Destination Unknown is a 1933 American drama film directed by Tay Garnett and written by Tom Buckingham.  The film stars Pat O'Brien, Ralph Bellamy, Alan Hale, Sr., Russell Hopton, Tom Brown and Betty Compson.  The film was released on April 1, 1933, by Universal Pictures.

Supporting paragraphs: Tom Buckingham George Sherman
Answer: film director