Sen Yung, later known professionally as Victor Sen Young (born Sen Yew Cheung; October 18, 1914 – c. November 9, 1980); one source lists his given name as Victor Cheung Young with the birth year 1915)) was an American character actor, best known for playing Jimmy Chan in the Charlie Chan films and Hop Sing in the western series Bonanza. He was born in San Francisco, California to Gum Yung Sen and his first wife, both immigrants from China. When his mother died during the flu epidemic of 1919, his father placed Victor and his younger sister, Rosemary, in a children's shelter, and returned to his homeland to seek another wife. He returned in 1922 with his new wife, Lovi Shee, once again forming a household with his two children. Career Sen Yung made his first significant acting debut in the 1938 film Charlie Chan in Honolulu, as the Chinese detective's "number two son", Jimmy Chan. In this movie, Sidney Toler replaced the recently deceased Warner Oland as Charlie Chan and Sen Yung replaced Oland's "number one son" Lee, who had been played by Keye Luke. Luke left the series in 1938, leading to the need for a "number two son". Sen Yung played Jimmy Chan in 11 Charlie Chan films between 1938 and 1942. Sen Yung played the character of Jimmy Chan very much as Luke played Lee Chan, namely as the bumbling, Americanized son who constantly hinders his father's work. The cultural clash between Chan père, a Chinese immigrant whose values were fundamentally those of China as expressed in his amusing pseudo-Confucian aphorisms vs. his well meaning, but inept Americanized sons gave the series much of its appeal, together with the fact that for all of Charlie Chan's putdowns of his sons there was a genuine paternal love and warmth being expressed. Moonlighting from the popular Chan series, Sen Yung won critical acclaim playing the nuanced role of Ong Chi Seng, a young attorney assisting Howard Joyce (played by James Stephenson), defending Leslie Crosbie (played by Bette Davis), accused of murder in the classic Warner Bros. film noir melodrama, The Letter (1940), directed by William Wyler. In common with other Chinese-American actors, Sen Yung was cast in Japanese parts during World War II, such as his role as the treacherous Japanese-American Joe Totsuiko in the 1942 Humphrey Bogart film Across the Pacific. During World War II he joined