Gregory was born in Pavlovsk, Russia. He was a civil engineer and the author of a number of books and scientific journal articles in his field. His memoir "Russia, My Native Land" recounted his experiences as a boy and young man in Russia, where he served in the military during World War I. His mother, was Valentina Ivanovna Chebotareva and his father was Porphyry Grigorievich Chebotarev, an officer of the Don Cossack Guard Battery.
He completed his studies to become an engineer at a university in Germany and worked as an engineer in Cairo, Egypt for seven years. In 1937 he took a position at Princeton University, where he eventually became a full professor of civil engineering.
He married Florence Dorothy Bill, the daughter of historian Alfred H. Bill, in 1938. His sister Valentina married one of Florence's brothers. He is buried with Florence B Tschebotarioff (1907-1997) and Natalie R. McCoy (1907-1991).
Florence Dorothy Bill Tschebotarioff
1907–1997 (m. 1939)
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