He prepared at the Albany Academy, where he was active in baseball, swimming, and publications. At Princeton he majored in history, joined Key and Seal Club, and was active in Whig-Clio, the Bridge Club, and the Debate Panel.
After two years of service as a first lieutenant in the Army, he earned an MBA at Harvard Business School.
Tom then joined the investment banking firm of Kuhn, Loeb & Co. He became a partner and served on the firm’s executive committee. In 1975 he founded his own financial-services firm, Thomas E. Dewey Jr. & Co., and subsequently co-founded McFarland, Dewey & Co. He worked well into his late 80s.
He served on numerous boards, on the New York City Housing Development Corp., and as an active trustee and chairman of the board of Lenox Hill Hospital for more than 50 years.
Tom was respected for his deep integrity and kindness, remaining always optimistic about people, life, and even politics. He loved New York, the Metropolitan Opera, WQXR (which was never off), and the Mets.
Tom is survived by his wife of 62 years, Ann R.L. Dewey; his children, Thomas E.L. Dewey, Elizabeth D. Grattan, and George R. Dewey; and his grandchildren, Frances K. Dewey, Thomas D. Dewey, and Charles J. Dewey. He was predeceased by his brother, John.