Question: Mitchell Leisen and Terence Fisher, are British?

Context articles: No Time for Love (1943 film)
Doane Harrison
Darling, How Could You!
The Big Broadcast of 1937
Arise, My Love
Terence Fisher
I Wanted Wings
13 Hours by Air
Mitchell Leisen
Practically Yours

No Time for Love is a 1943 American romantic comedy film produced and directed by Mitchell Leisen and starring Claudette Colbert and Fred MacMurray.
 Written by Claude Binyon, Robert Lees, and Frederic I. Rinaldo, the film is about a sophisticated female photographer assigned to photograph the tough "sandhog" construction workers at a tunnel project site.
 After saving one of the sandhogs from a fatal accident, she becomes attracted to this cocky well-built man they call Superman.
 Unsettled by her feelings, she hires the man as her assistance, believing that her attraction to him will diminish if she spends time with him.
 Their time together, however, leads to feelings of love, and she struggles to overcome her haughtiness and make her true feelings known.
Doane Harrison (September 19, 1894 – November 11, 1968) was an American film editor and producer whose career spanned four decades.
 For nearly twenty years, from 1935–54, he was a prolific editor of films for Paramount Pictures, including eleven films with director Mitchell Leisen.
 For twenty-five years, from 1941–1966, Harrison edited or produced all the films directed by Billy Wilder, who is now considered as one of the great 20th Century filmmakers.
Darling, How Could You!
 (1951) is a comedy film directed by Mitchell Leisen and starring Joan Fontaine and John Lund.
 The script is based on the James Barrie play "Alice Sit-by-the-Fire".
 The film was directed by Mitchell Leisen.
The Big Broadcast of 1937 is a 1936 Paramount Pictures production directed by Mitchell Leisen, and is the third in the series of Big Broadcast movies.
 The musical comedy stars Jack Benny, George Burns, Gracie Allen, Bob Burns, Martha Raye, Shirley Ross, Ray Milland, Benny Fields, Frank Forest and the orchestra of Benny Goodman (featuring Gene Krupa).
 Uncredited roles include Jack Mulhall.
 The version shown in British cinemas also included clips featuring Richard Tauber and the Vienna Boys Choir, not in the original American version.
Arise, My Love is a 1940 American romantic comedy film made by Paramount Pictures, directed by Mitchell Leisen, written by Billy Wilder, Charles Brackett and Jacques Théry.
 The film stars Claudette Colbert, Ray Milland and Dennis O'Keefe.
 Notable for its interventionist message, it tells the love story of a pilot and a journalist who meet in the latter days of the Spanish Civil War and follows them through the early days of World War II.
 Colbert once said that "Arise, My Love" was her personal favorite film of all the ones she had made.
Terence Fisher (23 February 1904 – 18 June 1980) was a British film director who worked for Hammer Films.
I Wanted Wings is a 1941 American drama film directed by Mitchell Leisen and based on a book by Lieutenant Beirne Lay, Jr. The film stars Ray Milland and William Holden.
 The supporting cast includes Wayne Morris, Brian Donlevy, Constance Moore and Veronica Lake.
13 Hours by Air (aka 20 Hours by Air) is a 1936 drama film made by Paramount Pictures and directed by Mitchell Leisen.
 The film stars Fred MacMurray and Joan Bennett.
 The screenplay was written by Kenyon Nicholson and Bogart Rogers, based on story "Wild Wings" by Bogart Rogers and Frank Mitchell Dazey.
 "13 Hours by Air" was also the forerunner of the disaster film, a genre featuring a complex, heavily character-driven ensemble cast film, exploring the personal dramas and interactions that develop among the passengers and crew as they deal with a deadly onboard emergency.
Mitchell Leisen (October 6, 1898 – October 28, 1972) was an American director, art director, and costume designer.
Practically Yours is a 1944 comedic film made by Paramount Pictures, directed by Mitchell Leisen, written by Norman Krasna, and starring Claudette Colbert and Fred MacMurray.