Chauncey Mitchell Depew was an attorney for Cornelius Vanderbilt

Cornelius Vanderbilt

Cornelius Vanderbilt , also known by the sobriquet Commodore, was an American entrepreneur who built his wealth in shipping and railroads. He was also the patriarch of the Vanderbilt family and one of the richest Americans in history...

's railroad interests, president of the New York Central Railroad System, and a United States Senator

United States Senate

The United States Senate is the upper house of the bicameral legislature of the United States, and together with the United States House of Representatives comprises the United States Congress. The composition and powers of the Senate are established in Article One of the U.S. Constitution. Each...

 from New York

New York

New York is a state in the Northeastern region of the United States. It is the nation's third most populous state. New York is bordered by New Jersey and Pennsylvania to the south, and by Connecticut, Massachusetts and Vermont to the east...

 from 1899 to 1911.
He was born on April 23, 1834. He attended Peekskill Military Academy

Peekskill Military Academy

Peekskill Military Academy was founded as 'Peekskill Academy'. It was a military academy for young men and women, founded in 1833, located in Peekskill, New York, United States. The academy was built by a hanging tree and when a building was built near the great tree , one of the British who was...

 for 12 years. He then attended Yale University

Yale University

Yale University is a private, Ivy League university located in New Haven, Connecticut, United States. Founded in 1701 in the Colony of Connecticut, the university is the third-oldest institution of higher education in the United States...

 from 1852 to 1856. He had second dispute appointments Junior and Senior years; speaker at Junior Exhibition and Commencement; member of the Thulia Boat Club, Linonia (third president), Kappa Sigma Epsilon, Kappa Sigma Theta, Psi Upsilon

Psi Upsilon

Psi Upsilon is the fifth oldest college fraternity in the United States, founded at Union College in 1833. It has chapters at colleges and universities throughout North America. For most of its history, Psi Upsilon, like most social fraternities, limited its membership to men only...

, and Skull and Bones

Skull and Bones

Skull and Bones is an undergraduate senior or secret society at Yale University, New Haven, Connecticut. It is a traditional peer society to Scroll and Key and Wolf's Head, as the three senior class 'landed societies' at Yale....

.

Following his graduation from Yale, Depew entered the office of Edward Wells, a lawyer in Peekskill, as a student.