Harriman attended Princeton University, where he was a member of the Ivy Club, and graduated in 1883.
Harriman started his career at Winslow, Lanier & Company, an investment firm in New York City, where he worked from 1883 to 1888. He became a partner in Harriman & Company in 1888. Harriman served on the Board of Directors of the Continental Trust Company of New New York
Harriman died on August 14, 1940 in Silver Spring, Maryland.
His funeral was held in White Plains, New York, where he was buried. His widow died a decade later, on March 28, 1950.
Member Harriman & Company Member all principal
Married Grace Carley, January 28, 1891.