He was born at the family farm that is now part of the
Thunder Ridge Ski Area on
New York State Route 22. He was the son of Henry B. Stephens, a two-term
Sheriff of Putnam County, New York, and Alice Mallory Stephens. He attended school in Patterson, and graduated from
Brewster High School. Stephens worked for the Harlem Valley Electric Company after high school, and worked with crews that brought the first electric service to Patterson and
Pawling. In 1914, he was married to Grace Hine of Brewster, and had three children. During
World War I, he served in the
United States Navy. In 1927, the couple relocated to Brewster. In 1923, he was elected Supervisor of the Town of Patterson. He was a member of the
New York State Assembly (Putnam Co.) in
1926,
1927,
1928,
1929,
1930,
1931,
1932,
1933,
1934,
1935,
1936,
1937,
1938,
1939–40,
1941–42,
1943–44,
1945–46,
1947–48,
1949–50 and
1951–52. He was Chairman of the Committee on Ways and Means Committee for nine years, and at times sat on the Rules Committee, the New York City Committee, the Public Service Committee, Joint Legislative Committee on Banking, the Committee on Military Affairs, and the legislative group formed to investigate the dairy industry. He was also chairman of the Putnam County Republican Committee for several years, which gave him influence over candidates for local office. In 1952, he retired from the Assembly, and the seat was taken over by his son
Willis H. Stephens. Mallory Stephens was a shrewd businessman whose interests included the Stephens homestead farm, which he sold in 1956 to the business group that created the Birch Hill Game Farm there. The historic Little Red Schoolhouse in Patterson was also located on the Stephens farm, where his wife taught and his daughter Alice attended. He was also an officer of the Maust, Coal, and Coke Corporation, an officer of the Modern Industrial Bank alongside
Channing H. Tobias, and the Knickerbocker Associates, a real estate and insurance firm. Stephens was a member of the Patterson Presbyterian Church, the Patterson Grange, the Putnam Westchester Pomona Grange, and the
National Grange. Stephens died in New York Hospital on January 11, 1961, of a heart ailment. He was buried in the Maple Avenue Cemetery in Patterson. His son, Willis, and grandson,
Willis Jr., occupied his assembly seat from 1952 until 2006. By H.R. 5685 of the
United States Congress, the
United States Postal Service office located at 19 Front Street in Patterson is known as the D. Mallory Stephens Post Office. ==See also==