Are both Vincente Minnelli and Herbert Ross American?
yes
Vincente Minnelli
Vincente Minnelli (February 28, 1903 – July 25, 1986) was an American stage director and film director, famous for directing such classic movie musicals as "Meet Me in St. Louis", "Gigi", "The Band Wagon", and "An American in Paris".
 In addition to having directed some of the most famous and well-remembered musicals of his time, Minnelli made many comedies and melodramas.
 He was married to Judy Garland from 1945 until 1951; they were the parents of Liza Minnelli.
Herbert Ross
Herbert David Ross (May 13, 1927 – October 9, 2001) was an American actor, choreographer, director and producer who worked predominantly in the stage and film.
Drew Casper
Joseph Andrew "Drew" Casper is a Professor of Critical Studies in the School of Cinematic Arts at the University of Southern California and considered an authority on American film from World War II to the present.
 While a Ph.D. student at USC, Dr. Casper's mentor, Irwin Blacker, died suddenly and the Cinema department offered Dr. Casper a position.
 Casper has risen to become the third-highest-paid person at USC.
 In the fall of 1997, the estate of Alfred Hitchcock and USC made Dr. Casper the first Alma and Alfred Hitchcock Professor for the Study of American Film.
 Casper provides a steady stream of DVD commentaries and expertise on films.
 He is the author of books about Vincente Minnelli, Stanley Donen, a book on Postwar Hollywood 1946–1962., and a volume called Hollywood Film, 1963-1976: Years of Revolution and Reaction, publisher=Wiley-Blackwell 2011 Gigi (1958 film)
Gigi ] is a 1958 American musical-romance film directed by Vincente Minnelli processed using MGM's Metrocolor.
 The screenplay by Alan Jay Lerner is based on the 1944 novella of the same name by Colette.
 The film features songs with lyrics by Lerner and music by Frederick Loewe, arranged and conducted by André Previn. Minnelli on Minnelli: Live at the Palace
Minnelli on Minnelli: Live at the Palace was a concert presented by Liza Minnelli at the Palace Theatre on Broadway from December 8, 1999 through January 2, 2000.
 The show consisted of songs featured in films directed by her father, Vincente Minnelli (1903-1986). Babes on Broadway
Babes on Broadway is a 1941 American musical film starring Mickey Rooney and Judy Garland and directed by Busby Berkeley, with Vincente Minnelli directing Garland's big solo numbers.
 The film, which features Fay Bainter and Virginia Weidler, was the third in the "Backyard Musical" series about kids who put on their own show, following "Babes in Arms" (1939) and "Strike Up the Band" (1940).
 Songs in the film include "Babes on Broadway" by Burton Lane (music) and E.Y. "Yip" Harburg (lyrics), and "How About You?
" by Lane with lyrics by Ralph Freed, the brother of producer Arthur Freed.
 The movie ends with a minstrel show performed by the main cast in blackface. An American in Paris (film)
An American in Paris is a 1951 American musical film inspired by the 1928 orchestral composition "An American in Paris" by George Gershwin.
 Starring Gene Kelly, Leslie Caron, Oscar Levant, Georges Guétary, and Nina Foch, the film is set in Paris, and was directed by Vincente Minnelli from a script by Alan Jay Lerner.
 The music is by George Gershwin, with lyrics by his brother Ira, with additional music by Saul Chaplin, the music director. On a Clear Day You Can See Forever (film)
On a Clear Day You Can See Forever is a 1970 American musical comedy-drama fantasy film directed by Vincente Minnelli.
 The screenplay by Alan Jay Lerner is adapted from his book for the 1965 stage production of the same name.
 The songs feature lyrics by Lerner and music by Burton Lane.
 The American Film Institute has listed "On a Clear Day You Can See Forever" as one of the 100 greatest musical films ever. 1952 Cannes Film Festival
The 5th Cannes Film Festival was held from 23 April to 10 May 1952.
 As in the previous three festivals, the entire jury of this festival was made up of French persons, with Maurice Genevoix as the Jury President.
 The Grand Prix of the Festival went to the "Two Cents Worth of Hope" by Renato Castellani and "Othello" by Orson Welles.
 The festival opened with "An American in Paris" by Vincente Minnelli. A Matter of Time (film)
A Matter of Time is a 1976 American-Italian musical fantasy film starring Liza Minnelli and Ingrid Bergman, directed by Vincente Minnelli.
 The screenplay by John Gay is based on the novel "The Film of Memory" by Maurice Druon.
 The fictional story is based loosely on the real life exploits of the infamous Italian eccentric, the Marchesa Casati, whom Druon knew during her declining years in London while he was stationed there during World War II.
 The film marked the first screen appearance for Isabella Rossellini, the last for Charles Boyer, and it proved to be Vincente Minnelli's final project.