Question: Were both Hal Yates and Robert Mulligan American?

Context paragraphs:
Variety Time: Variety Time is a 1948 American variety film directed by Hal Yates.  The film is a composite of two film shorts interspersed with routines by Jack Paar and musical numbers lifted from various RKO productions.  The screenplay was written in parts by several different writers: Hal Law, Hal Yates, Leo Solomon, and Joseph Quillan.  Aside from Paar, the film also stars Edgar Kennedy and Leon Errol, each in one of the film shorts.

Richard Mulligan: Richard Mulligan (November 13, 1932 – September 26, 2000) was an American television, film and character actor known for his role as Burt Campbell, the loving, preventive husband of Cathryn Damon's character, in the sitcom "Soap" (1977–81) and later for his starring role as Dr. Harry Weston in "Empty Nest" (1988–95).  He was the younger brother of film director Robert Mulligan.

Mama Runs Wild: Mama Runs Wild is a 1937 American comedy film directed by Ralph Staub and written by Gordon Kahn and Hal Yates.  The film stars Mary Boland, Ernest Truex, William "Bill" Henry, Lynne Roberts, Max Terhune and Joseph Crehan.  The film was released on December 22, 1937, by Republic Pictures.

Nobody's Baby (1937 film): Nobody's Baby is a 1937 American comedy film directed by Errol Taggart and written by Harold Law, Hal Yates and Pat C. Flick.  The film stars Patsy Kelly, Lyda Roberti, Lynne Overman, Robert Armstrong, Rosina Lawrence and Don Alvarado.  The film was released on April 23, 1937, by Metro-Goldwyn-Mayer.

Hal Yates: Hal Yates (26 July 1899 – 1 August 1969) was an American screenwriter and film director.  He wrote for 96 films between 1924 and 1953.  He also directed 88 films between 1926 and 1953.

Footlight Varieties: Footlight Varieties is the third and final effort in the RKO series of variety films, combining film shorts with musical numbers and routines by Jack Paar.  Directed by Hal Yates, the screenplay was written by Yates and Felix Adler.  In addition to Paar, the film stars Leon Errol, and includes performances by The Sportsmen, Liberace, Jerry Murad's Harmonicats, and Red Buttons.

The Great Impostor: The Great Impostor is a 1961 movie based on the true story of an impostor named Ferdinand Waldo Demara.  The film is loosely based on Robert Crichton's 1959 biography of the same name, it stars Tony Curtis in the title role, and was directed by Robert Mulligan.  The film only loosely follows Demara's real-life exploits, and is much lighter in tone than the book on which it is based.

Robert Surtees (cinematographer): Robert L. Surtees, A.S.C. (August 9, 1906 – January 5, 1985) was an American cinematographer who won three Academy Awards for the films "King Solomon's Mines", "The Bad and the Beautiful" and the 1959 version of "Ben Hur".  Surtees has worked at various studios, including Universal, UFA, Warner Brothers, and MGM alongside directors such as Robert Mulligan, Peter Bogdanovich, and Vincente Minnelli gaining him a reputation as one of the most versatile cinematographers to date.

Robert Mulligan: Robert Patrick Mulligan (August 23, 1925 – December 20, 2008) was an American film and television director best known as the director of humanistic American dramas, including "To Kill a Mockingbird" (1962), "Summer of '42" (1971), "The Other" (1972), "Same Time, Next Year" (1978) and "The Man in the Moon" (1991).  He was also known in the 1960s for his extensive collaborations with producer Alan J. Pakula.  He was the elder brother of actor Richard Mulligan.

The Rat Race: The Rat Race is a 1960 American drama film directed by Robert Mulligan and starring Tony Curtis and Debbie Reynolds as struggling young entertainment professionals in New York City.  Filming took place in Pittsburgh, Pennsylvania.  Sam Butera and Gerry Mulligan have minor roles as saxophonists.

Supporting paragraphs: Hal Yates Robert Mulligan
Answer: yes