Adam Badeau (December 29, 1831 - March 19, 1895) was an author, Union Army officer, and diplomat. Adam Badeau was born in New York City on December 29, 1831. He was raised and educated in Tarrytown and North Tarrytown (now Sleepy Hollow), and became a clerk in New York City's Street Department.He also studied law, and attained admission to the bar in 1855. In addition, Badeau was a writer, and his work as an essayist and theater critic was published in Noah's Sunday Times.