Question: Jean Negulesco and Colin Campbell are both film directors and screenwriters but which is also an actor?

Context articles: Take Care of My Little Girl
Three Coins in the Fountain (film)
Expensive Husbands
Crash Donovan
Daddy Long Legs (1955 film)
Swamp Water
Lure of the Wilderness
Colin Campbell (director)
The Gay Parisian
Jean Negulesco

Take Care of My Little Girl is a 1951 drama film directed by Jean Negulesco.
 It stars Jeanne Crain, Dale Robertson, Mitzi Gaynor and Jean Peters.
Three Coins in the Fountain is a 1954 American romantic comedy film directed by Jean Negulesco and starring Clifton Webb, Dorothy McGuire, Jean Peters, Louis Jourdan, Rossano Brazzi, and Maggie McNamara.
 Written by John Patrick, the film is about three American women working in Rome who dream of finding romance in the Eternal City.
Expensive Husbands is a 1937 American comedy film directed by Bobby Connolly and written by Lillie Hayward, Jean Negulesco and Jay Brennan.
 The film stars Patric Knowles, Beverly Roberts, Allyn Joslyn, Gordon Oliver, Vladimir Sokoloff and Eula Guy.
 The film was released by Warner Bros. on November 27, 1937.
Crash Donovan is a 1936 American drama film directed by William Nigh and Jean Negulesco and starring Jack Holt, John 'Dusty' King and Nan Grey.
 It marked the directorial debut of the Romanian-born Negulesco.
Daddy Long Legs (1955) is a Hollywood musical comedy film set in France, New York City, and the fictional college town of Walston, Massachusetts.
 The film was directed by Jean Negulesco, and stars Fred Astaire, Leslie Caron, Terry Moore, Fred Clark, and Thelma Ritter, with music and lyrics by Johnny Mercer.
 The screenplay was written by Phoebe Ephron and Henry Ephron, loosely based on the 1912 novel "Daddy-Long-Legs" by Jean Webster.
Swamp Water is a 1941 film directed by Jean Renoir, starring Walter Brennan and Walter Huston, produced at 20th Century Fox, and based on the novel by Vereen Bell.
 The film was shot on location at Okefenokee Swamp, Waycross, Georgia, USA.
 This was Renoir's first American film.
 The movie was remade in 1952 as "Lure of the Wilderness", directed by Jean Negulesco.
Lure of the Wilderness is a 1952 romantic adventure film directed by Jean Negulesco.
 The film, which was shot in Technicolor, is based on the 1941 novel "Swamp Water" by Vereen Bell, and is a remake of the Jean Renoir's 1941 adaption of the novel featuring Walter Brennan in a smaller version of his leading role in the earlier film.
James Colin Campbell (11 October 1859 – 26 August 1928) was a Scottish-born film director, actor and screenwriter.
 He directed 177 films between 1911 and 1924.
 He also wrote for 60 films between 1911 and 1922.
 He was born in Scotland, and died in Hollywood, California.
The Gay Parisian is an American short film produced in 1941 by Warner Bros. and directed by Jean Negulesco.
 The film is a screen adaptation, in Technicolor, of the 1938 ballet "Gaîté Parisienne", choreographed by Léonide Massine to music by Jacques Offenbach.
 It was nominated for an Academy Award at the 14th Academy Awards for Best Short Subject (Two-Reel).
Jean Negulesco (born Ioan Negulescu; 29 February 1900 (O.S.) – 18 July 1993) was a Romanian-American film director and screenwriter.