Some context: David Michael Letterman (born April 12, 1947) is an American television host, comedian, writer, and producer. He hosted a late night television talk show for 33 years, beginning with the February 1, 1982, debut of Late Night with David Letterman on NBC, and ending with the May 20, 2015, broadcast of Late Show with David Letterman on CBS. In total, Letterman hosted 6,028 episodes of Late Night and Late Show, surpassing friend and mentor Johnny Carson as the longest-serving late night talk show host in American television history. In 1996 Letterman was ranked 45th on TV Guide's 50 Greatest TV Stars of All Time.
In 1975, encouraged by his then-wife Michelle and several of his Sigma Chi fraternity brothers, Letterman moved to Los Angeles, with hope of becoming a comedy writer. He and Michelle packed their belongings in his pickup truck and headed west. As of 2012, he still owned the truck. In Los Angeles, he began performing comedy at The Comedy Store. Jimmie Walker saw him on stage; with an endorsement from George Miller, Letterman joined a group of comedians whom Walker hired to write jokes for his stand-up act, a group that at various times would also include Jay Leno, Paul Mooney, Robert Schimmel, Richard Jeni, Louie Anderson, Elayne Boosler, Byron Allen, Jack Handey, and Steve Oedekerk.  By the summer of 1977, Letterman was a writer and regular on the six-week summer series The Starland Vocal Band Show, broadcast on CBS. He hosted a 1977 pilot for a game show entitled The Riddlers (that was never picked up), and co-starred in the Barry Levinson-produced comedy special Peeping Times that aired in January 1978. Later that year, Letterman was a cast member on Mary Tyler Moore's variety show, Mary. Letterman made a guest appearance on Mork & Mindy (as a parody of EST leader Werner Erhard) and appearances on game shows such as The $20,000 Pyramid, The Gong Show, Hollywood Squares, Password Plus and Liar's Club, as well as the Canadian cooking show Celebrity Cooks (November 1977), talk shows such as 90 Minutes Live (February 24 and April 14, 1978), and The Mike Douglas Show (April 3, 1979 and February 7, 1980). He was also screen tested for the lead role in the 1980 film Airplane!, a role that eventually went to Robert Hays.  His dry, sarcastic humor caught the attention of scouts for The Tonight Show Starring Johnny Carson, and Letterman was soon a regular guest on the show. Letterman became a favorite of Carson and was a regular guest host for the show beginning in 1978. Letterman credits Carson as the person who influenced his career the most.
What group did he join?
A: a group of comedians whom Walker hired to write jokes for his stand-up act, a group that at various times would also include Jay Leno,

Some context: Cesar Julio Romero Jr. was born in New York City on February 15, 1907, the son of Cesar Julio Romero Sr. and Maria Mantilla. His mother was said to be the biological daughter of Cuban national hero Jose Marti. His father was born in Barcelona, Spain and immigrated to the United States in 1888, where he was an expert merchant in commercial business. His mother was a concert singer.
At 6'3", Romero routinely played "Latin lovers" in films from the 1930s until the 1950s, usually in supporting roles. He starred as the Cisco Kid in six westerns made between 1939 and 1941. Romero danced and performed comedy in the 20th Century Fox films he starred in opposite Carmen Miranda and Betty Grable, such as Week-End in Havana and Springtime in the Rockies, in the 1940s. He also played a minor role as Sinjin, a piano player in Glenn Miller's band, in the 1942 20th Century Fox musical Orchestra Wives.  In The Thin Man (1934), Romero played a villainous supporting role opposite the film's main star William Powell. Many of Romero's films from this early period saw him cast in small character parts, such as Italian gangsters and East Indian princes. Romero had a lead role as the Pathan rebel leader, Khoda Khan, in John Ford's British Raj-era action film Wee Willie Winkie (1937) and The Little Princess (1939) alongside Shirley Temple. He also appeared in a comic turn as a foil for Frank Sinatra and his crew in Ocean's 11 (1960).  Romero sometimes played the leading man, for example in Allan Dwan's 15 Maiden Lane (1936) opposite Claire Trevor, as well as winning the key role of the Doc Holliday character (with name changed to "Doc Halliday") in Dwan's Wyatt Earp saga Frontier Marshal three years later. 20th Century Fox, along with mogul Darryl Zanuck, personally selected Romero to co-star with Tyrone Power in the Technicolor historical epic Captain from Castile (1947), directed by Henry King. While Power played a fictionalized character, Romero played Hernan Cortes, a historical conquistador in Spain's conquest of the Americas.
What role was he most noted for?
A:
in John Ford's British Raj-era action film Wee Willie Winkie (1937) and The Little Princess (1939) alongside Shirley Temple.