Question: Michael Anderson and Derek Estlin Purvis are both what?
Context: Shearwater Pottery is a small family-owned pottery in Ocean Springs, Mississippi, United States founded in 1928 by Peter Anderson (1901-1984), with the support of his parents, George Walter Anderson and Annette McConnell Anderson.  From the 1920s through the present day, the Pottery has produced art pottery, utilitarian ware, figurines, decorative tiles and other ceramic objects.  Two of its most important designers were Walter Inglis Anderson (1903-1965) and his brother James McConnell Anderson (1907-1998).  Although Shearwater was severely damaged by Hurricane Katrina in 2005, the workshop was rebuilt and restored by Jason Stebly.  Pottery continues to be thrown by Peter’s son James Anderson and the latter's son Peter Wade Anderson, and decorated by Patricia Anderson Findeisen, Christopher Inglis Stebly, Adele Anderson Lawton and others.  Michael Anderson heads the Shearwater Annex, and Marjorie Anderson Ashley is business manager. Sword of Gideon is a 1986 television film about Mossad agents hunting down terrorists associated with the 1972 Munich massacre.  It was first shown on the CTV network in Canada as a four-hour miniseries and later on the HBO television network.  Directed by Michael Anderson and written by Chris Bryant, the film stars Steven Bauer and Michael York.  The film is based on the book "Vengeance" by George Jonas, an account of the incident which has been criticized by some intelligence personnel as fictional, though because of its covert nature is difficult to prove or disprove.  In some countries the book was titled "Vengeance: Sword of Gideon", from which the movie title is drawn.  The story was retold in the 2005 film "Munich" by Steven Spielberg. The Wreck of the Mary Deare is a 1959 Metrocolor (in CinemaScope) British-American thriller film directed by Michael Anderson and starring Gary Cooper and Charlton Heston, and featuring Michael Redgrave, Cecil Parker, Richard Harris and John Le Mesurier.  The screenplay by Eric Ambler was based on the 1956 novel of the same name by Hammond Innes. The New Adventures of Pinocchio is a 1999 theatrical film that is a sequel to the 1996 film, "The Adventures of Pinocchio".  The film was directed by Michael Anderson and featured Martin Landau reprising his role as Geppetto with Udo Kier reprising his role as Lorenzini, but also playing Lorenzini's widow Madame Flambeau.  The film also featured Sarah Alexander, Simon Schatzberger, Warwick Davis and Ben Ridgeway, and introduced Gabriel Thomson as Pinocchio.  As of 2017, this is the last film Michael Anderson directed. Michael Joseph Anderson, Sr. (born 30 January 1920) is an English film director, best known for directing the Second World War film "The Dam Busters" (1955), the epic "Around the World in 80 Days" (1956) and the dystopian sci-fi film "Logan's Run" (1976). Play it Cool is a 1962 British musical film directed by Michael Winner and starring Billy Fury, Michael Anderson Jr., Helen Shapiro, Bobby Vee, Shane Fenton, Danny Williams, Dennis Price, Richard Wattis, Maurice Kaufmann and Anna Palk.  The film tells the story of a struggling singer, Billy Universe (Billy Fury), and his band, who befriend an heiress who, against the wishes of her father, (Dennis Price), is searching for her lover who she has been forbidden to see and who she is hoping to elope with.  The plot takes the main characters to a succession of nightclubs where the other stars are performing.  There are guest appearances by Lionel Blair and Bernie Winters as well as Norrie Paramor, who was the Sir George Martin of his day.  The only hit from the songs featured in the film was Fury's rendition of "Once Upon a Dream". 1984 is a 1956 British black-and-white science fiction drama film, freely based on the novel "Nineteen Eighty-Four" by George Orwell, depicting a totalitarian future society.  This is the first cinema rendition of the story, directed by Michael Anderson and starring Edmond O'Brien as protagonist Winston Smith, and featuring Donald Pleasence, Jan Sterling, and Michael Redgrave.  The character O'Brien, the antagonist, was renamed "O'Connor", due to the shared surname of the actor Edmond O'Brien. Public Enemies is a 2009 American biographical mob drama film directed by Michael Mann and written by Mann, Ronan Bennett and Ann Biderman.  It is an adaptation of Bryan Burrough's non-fiction book "Public Enemies: America's Greatest Crime Wave and the Birth of the FBI, 1933–34".  Set during the Great Depression, the film chronicles the final years of the notorious bank robber John Dillinger (Johnny Depp) as he is pursued by FBI agent Melvin Purvis (Christian Bale), Dillinger's relationship with Billie Frechette (Marion Cotillard), as well as Purvis' pursuit of Dillinger's associates and fellow criminals Homer Van Meter (Stephen Dorff) and Baby Face Nelson (Stephen Graham). Airtight is a 2014 American drama thriller film written, produced and directed by Derek Estlin Purvis.  A psychological thriller set in a NY mansion and an homage to Alfred Hitchcock, "Airtight" is based on the true events that inspired a play in the 1920s, an adaptation by Hitchcock in the 1940s and this feature film from 2013. Derek Estlin Purvis (born November 27, 1972) is an American film director, producer, executive producer, screenwriter, and entrepreneur.  He has financed, produced or directed 13 films of various genres.  He is a founder and creator of the Application Movie Pitch Pro.
Answer: film director