Question: Which American film Director was born earlier, Irving Cummings or Chris Buck?

Context paragraphs:
Louisiana Purchase (film): Louisiana Purchase is a 1941 film adaptation of the theater musical of the same name.  A Paramount Pictures production, the film was directed by Irving Cummings, with Robert Emmett Dolan serving as musical director as he had done for the play.

Springtime in the Rockies: Springtime in the Rockies is an American Technicolor musical comedy film released by Twentieth Century Fox in 1942.  It stars Betty Grable, with support from John Payne, Carmen Miranda, Cesar Romero, Charlotte Greenwood, and Edward Everett Horton.  Also appearing were Grable's future husband Harry James and his band.  The director was Irving Cummings.  The screenplay was based on the short story "Second Honeymoon" by Philip Wylie.

Lone Star Ranger: Lone Star Ranger is a 1942 American Western film directed by James Tinling and written by William Conselman Jr., Irving Cummings Jr. and George Kane.  The film stars John Kimbrough, Sheila Ryan, Jonathan Hale, William Farnum, Truman Bradley and George E. Stone.  The film was released on March 20, 1942, by 20th Century Fox.  It was the fourth and final film adaptation of the novel of the same name by Zane Grey.  William Farnum had appeared in the first adaptation of the novel, a 1919 silent film of the same name.  In that version he had starred in the leading role, which was named "Steele", who avenged the murder of Major McNeil, which is the role he plays in this film.

It's a Small World (film): It's a Small World is a 1935 screwball comedy film starring Spencer Tracy and Wendy Barrie, directed by Irving Cummings.  In production February 2–March 2, 1935, it was Barrie's American film debut.

Irving Cummings: Irving Camisky (October 9, 1888 – April 18, 1959) was an American movie actor, director, producer and writer.

Chris Buck: Chris Buck (born 1960/1961) is an American film director known for co-directing "Tarzan" (1999), "Surf's Up" (2007) (which was nominated for the 2008 Oscar for Best Animated Feature), and "Frozen" (2013) (which won the Oscar for Best Animated Feature in 2014).  He also worked as a supervising animator on "Home on the Range" (2004) and "Pocahontas" (1995).

Romance of the Underworld: Romance of the Underworld is a 1928 American silent film drama produced and distributed by Fox Film Corporation.  Directed by Irving Cummings and starring Mary Astor.  It is taken from a stage play called "A Romance of the Underworld" by Paul Armstrong.  A previous version of the story was filmed as "A Romance of the Underworld" in 1918 by director James Kirkwood with Catherine Calvert in Astor's part.  The 1928 film is extant at the Museum of Modern Art.

The World's Great Snare: The World's Great Snare is a 1916 American silent drama film produced by Adolph Zukor's Famous Players Film Company and distributed through Paramount Pictures.  The film is based on a novel of the same name by E. Phillips Oppenheim and was directed by Joseph Kaufman.  The film stars Pauline Frederick, a noted stage actress, and Irving Cummings, later a director, is the male lead.  The film is now considered lost.

Behind That Curtain (film): Behind That Curtain is a 1929 American Pre-Code mystery film directed by Irving Cummings, starring Warner Baxter and featuring Boris Karloff.  It was the first Charlie Chan film to be made at Fox Studios.  It was based on the novel of the same name.  Charlie Chan is played by Korean American actor E. L. Park, gets one mention early in the film, then makes a few momentary appearances after 75 minutes.  Producer William Fox chose this film to open the palatial Fox Theatre in San Francisco on June 28, 1929.  It was a sound film.

The Thirteenth Commandment: The Thirteenth Commandment is a 1920 American silent drama film directed by Robert G. Vignola and written by Alice Eyton.  The film stars Ethel Clayton, Charles Meredith, Monte Blue, Anna Q. Nilsson, Irving Cummings and Winter Hall.  It is based on the 1916 novel "The Thirteenth Commandment" by Rupert Hughes.  The film was released on January 17, 1920, by Paramount Pictures.  It is not known whether the film currently survives.

Supporting paragraphs: Irving Cummings Chris Buck
Answer: Irving Camisky