Background
Auchincloss was the son of Edgar Stirling Auchincloss (1847–1892) and Maria LeGrange Sloan. His uncles were Hugh Dudley Auchincloss (father of Hugh D. Auchincloss, Jr.) and John Winthrop Auchincloss (grandfather of Louis Auchincloss).
Auchincloss was the son of Edgar Stirling Auchincloss (1847–1892) and Maria LeGrange Sloan. His uncles were Hugh Dudley Auchincloss (father of Hugh D. Auchincloss, Jr.) and John Winthrop Auchincloss (grandfather of Louis Auchincloss).
He attended the Cutler School in New York City, and the Groton School, Groton, Massachusetts.
He graduated from Yale University in 1908.
He engaged in financial and stock brokerage business in New York City 1908-1940. He was a governor of the New York Stock Exchange from 1921 to 1938.