Question: Are Ralph Nelson and Spencer Gordon Bennet both television directors?
Context: Sunken Silver is a 1925 American film serial directed by Spencer Gordon Bennet and George B. Seitz.  The serial is preserved at UCLA Film & Television Center. Spencer Gordon Bennet (January 5, 1893 – October 8, 1987) was an American film producer and director.  Known as the "King of Serial Directors", he directed more film serials than any other director. Night Alarm is a 1934 American drama film directed by Spencer Gordon Bennet and starring Bruce Cabot as a down on his luck reporter, Hal Ashby, who tries to make a name for himself by investigating a series of bizarre arson attacks.  The film, which was a hit in movie theatres at the time, is now widely available in the public domain. Requiem for a Gunfighter is a 1965 American western film, the last picture directed by Spencer Gordon Bennet, produced by Alex Gordon, and starring Rod Cameron, Stephen McNally, Mike Mazurki, Dick Jones, and Olive Sturgess. Ralph Nelson (August 12, 1916 – December 21, 1987) was an American film and television director, producer, writer, and actor.  He was best known for directing the Oscar winning films "Lilies of the Field" (1963), "Father Goose" (1964), and "Charly" (1968). The Atomic Submarine is a 1959 independently made American black-and-white science fiction film, produced by Alex Gordon, directed by Spencer Gordon Bennet, that stars Arthur Franz, Dick Foran, Brett Halsey and Joi Lansing, with John Hilliard as the voice of the alien.  The film was distributed by Allied Artists Pictures Corporation. Captain Video: Master of the Stratosphere is a 15-chapter serial released by Columbia Pictures in 1951.  It was directed by Spencer Gordon Bennet and Wallace A. Grissel with a screenplay by Royal G. Cole, Sherman I. Lowe and Joseph F. Poland, based on a treatment by George H. Plympton.  The serial is unique for several reasons--- in particular, it is the only film serial ever based on a television program, "Captain Video and His Video Rangers". Avenging Waters is a 1936 western starring Ken Maynard, Beth Marion, Ward Bond and John Elliott.  It was written by Nat Gatzert and directed by Spencer Gordon Bennet. The Bounty Killer is a 1965 American Technicolor Western film directed by Spencer Gordon Bennet and written by Ruth Alexander and Leo Gordon in Techniscope.  The film stars Dan Duryea, Rod Cameron, Audrey Dalton, Richard Arlen, Buster Crabbe and Fuzzy Knight.  The film was released on July 31, 1965, by Embassy Pictures. Superman (1948) is a 15-part black-and-white Columbia film serial based on the comic book character Superman.  It stars an uncredited Kirk Alyn (billed only by his character name, Superman; but credited on the promotional posters) and Noel Neill as Lois Lane.  Like "Batman", it is notable as the first live-action appearance of Superman on film and for the longevity of its distribution.  The serial was directed by Thomas Carr, who later directed many early episodes of the "Adventures of Superman" television show, and Spencer Gordon Bennet, produced by Sam Katzman and shot in and around Los Angeles, California.  It was originally screened at movie matinées and after the first three scene-setting chapters, every episode ends in a cliffhanger.  The Superman-in-flight scenes are animations, in part due to the small production budget.
Answer: no