William Richard Castle, Jr. (June 19, 1879 - October 14, 1963) was an Undersecretary of State in the Hoover administration and the United States Ambassador to Japan in 1930. Castle was born in Honolulu under the old Hawaiian monarchy. His father had been the kingdom\s Attorney General and King Kalakala\s Minister in Washington. He graduated from Harvard in 1900; and he became an instructor and was Assistant Dean from 1904 through 1913. From 1915 through 1917, he was editor of the Harvard Graduates Magazine. In later years, he would return to Cambridge as an Overseer of Harvard College from 1935 through 1941. When the U.S. entered World War I, he became Communications Director for the American Red Cross.
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