Question: Norman Tokar and D. Ross Lederman, share which occupation?

Context paragraphs:
D. Ross Lederman: David Ross Lederman (December 12, 1894 – August 24, 1972) was an American film director noted for his Western/action/adventure films of the 1930s and 1940s.

Texas Cyclone (film): Texas Cyclone is a 1932 American Pre-Code Western film directed by D. Ross Lederman.  The film stars Tim McCoy as "Texas Grant", Shirley Grey, Wheeler Oakman and John Wayne, and features an early appearance by Walter Brennan.

Glamour for Sale: Glamour for Sale is a 1940 American crime film directed by D. Ross Lederman and starring Anita Louise, Roger Pryor and Frances Robinson.

Shadows on the Stairs: Shadows on the Stairs is a 1941 British film directed by D. Ross Lederman.

Norman Tokar: Norman Tokar (November 25, 1919 in Newark, New Jersey – April 6, 1979 in Hollywood) was a prolific director (and occasionally writer and producer) of serial television and feature films, who directed many of the early episodes of "Leave it to Beaver", and found his greatest success directing over a dozen films for Walt Disney Productions, spanning the 1950s to the 1970s.

Shadows of the Night (film): Shadows of the Night is a 1928 American drama silent film directed by D. Ross Lederman and written by Robert E. Hopkins and D. Ross Lederman.  The film stars Flash the Dog, Lawrence Gray, Louise Lorraine, Warner Richmond and Tom Dugan.  It was released on October 26, 1928, by Metro-Goldwyn-Mayer.

Busses Roar: Busses Roar is a 1942 film directed by D. Ross Lederman and starring Richard Travis and Julie Bishop.

Bullet Scars: Bullet Scars is a 1942 American film produced and distributed by Warner Bros. It was directed by D. Ross Lederman with top-billed stars Regis Toomey, Adele Longmire and Howard DaSilva.

The Tanks Are Coming (1951 film): The Tanks Are Coming is a 1951 War film directed by D. Ross Lederman, starring Steve Cochran and Philip Carey.

Tarzan's Revenge: Tarzan's Revenge is a 1938 American adventure film starring Glenn Morris in his only outing as Tarzan.  Eleanor Holm, a popular swimming star, co-starred as Eleanor Reed.  The film was produced by Sol Lesser, written by R. Lee Johnson and Jay Vann (based on the character created by Edgar Rice Burroughs) and directed by D. Ross Lederman.  Sol Lesser cast two Olympic athletes in "Tarzan's Revenge": 1936 decathlon champion Glenn Morris as Tarzan and aquatic medal-winner Eleanor Holm as "Eleanor".

Supporting paragraphs: Norman Tokar D. Ross Lederman
Answer: film director