Val Avery (July 14, 1924 – December 12, 2009), born Sebouh Der Abrahamian, was an American character actor who appeared in hundreds of movies and television shows.
 In a career that spanned 50 years, Avery appeared in over 100 films and had appearances in over 300 television series.
Frank E. Rosenfelt (November 15, 1921 – August 2, 2007) was an American executive who served as CEO of Metro-Goldwyn-Mayer (MGM) studio under MGM owner Kirk Kerkorian from 1972 until 1982.
 Additionally, Rosenfelt spearheaded the acquisition of United Artists by MGM in 1981.
Tracinda Corporation is an American private investment corporation that was owned by the late Kirk Kerkorian.
 Its major investments include a minority interest of MGM Resorts International.
 Tracinda is headquartered in Las Vegas, Nevada.
 The company was named after Kerkorian's daughters, Tracy and Linda.
Jerome Bailey York (June 22, 1938 – March 18, 2010), commonly known as Jerry York, was an American businessman, and the Chairman, President and CEO of Harwinton Capital.
 He was the former CFO of IBM and Chrysler, and was CEO of Micro Warehouse.
 He was a chief aide to Kirk Kerkorian and his Tracinda investment company.
 In February 2006, Kerkorian helped elect York to the board of directors of General Motors, from which he had previously resigned.
Kerkor "Kirk" Kerkorian (June 6, 1917 – June 15, 2015) was an Armenian-American businessman, investor, and philanthropist.
 He was the president and CEO of Tracinda Corporation, his private holding company based in Beverly Hills, California.
 Kerkorian is known for having been one of the important figures in the shaping of Las Vegas and, with architect Martin Stern, Jr. described as the "father of the mega-resort".
 He built the world's largest hotel in Las Vegas three times: the International Hotel (opened in 1969), the MGM Grand Hotel (1973) and the MGM Grand (1993).
 He purchased the Metro-Goldwyn-Mayer movie studio in 1969.
100 Centre Street is an American legal drama created by Sidney Lumet and starring Alan Arkin, Val Avery, Bobby Cannavale, Joel de la Fuente and Paula Devicq.
Paul Curtis Steelman, a native of Atlantic City, is an American architect that is recognized as a visionary designer of global entertainment, hospitality, and gaming architecture based in Las Vegas, Nevada and Macau.
 Paul has designed buildings for the mavericks of the gaming industry, including Kirk Kerkorian, Steve Wynn, Sheldon Adelson, Francis Lui, Lawrence Ho, Tan Sri Dato' Lim Kok Thay, Tan Sri Dr Chen Lip Keong, Prince Albert of Monaco, Bob Stupak, Frank Modica, Phil Satre, Derek Stevens and Stanley Ho.
Daniel Van Kirk (born Daniel Nall) is an American comedian, podcast personality, and writer from Rochelle, Illinois.
 He earned his Bachelor of Fine Arts in theater performance from Roosevelt University.
 He appears as himself and as comedic caricatures on several podcasts such as "Sklarbro Country" with Randy and Jason Sklar as a regular, "The Bear Down Podcast" and "The Todd Glass Show" as well as hosting "Hindsight with Daniel Van Kirk" on the Steve Dahl Network.
 Van Kirk has appeared on Doug Benson's podcast, "Doug Loves Movies", in character as Mark Wahlberg.
 A mini-game on the podcast is "Doing Lines with Mark", in which Van Kirk - either in person or via recording - will recite a film quote as Wahlberg; and a contestant must name the film where the quote is taken from.
 Van Kirk has also appeared on the podcast in character as Steven Seagal.
Gregson Edward Bautzer (April 3, 1911 – October 26, 1987) was an American attorney, representing such stars as Ginger Rogers, Ingrid Bergman and Joan Crawford, Kirk Kerkorian, Howard Hughes and William R. Wilkerson.
Fade Out: The Calamitous Final Days of MGM is a 1990 non-fiction book by Peter Bart which covers the history of MGM since 1969, when it was bought by Kirk Kerkorian.
 Bart was an executive at MGM in 1983 and 1984.

Question: Who appeared in the most movies, Kirk Kerkorian or Val Avery?
Answer: Val Avery