He was the corporate director of the New England Telephone Co., Baines Engineering Co., Stamford Water Co., Ct Light and Power, and Phoenix Insurance Co. He graduated from Dartmouth College in 1925.
Harold E. Rider was a successful businessman served the community on many boards earning him the Citizen of the Year Award. He was president of the Connecticut Bankers Association, president of Stamford Hospital, chairman of the United Fund in Stamford (which became the United Way), Trustee of the University of Connecticut Foundation, and member of the Connecticut Public Expenditure Council. He was also the chairman of the board at the Union Trust Co. until he retired in 1971.