Traphagen was born in
Nyack, New York on October 20, 1889 into a family long associated with politics and business. He was a son of Caroline Ross ( Maxwell) Traphagen (1853–1936) and
William Conselyea Traphagen (1837–1894). Among his siblings were Eleanor Van Vorst Traphagen (wife of William Bisland Williams Jr.), Ethel Traphagen (founder of the
Traphagen School of Fashion and wife of artist
William Robinson Leigh), and Maxwell Eustace Traphagen (who married Sarah Neilson Stearns). His father was an attorney who was elected a member of the
New York State Senate representing the
10th District, New York City. His paternal grandparents were Henry Mackaness Traphagen and Sarah ( Conselyea) Traphagen. His father and uncle
Henry Traphagen, the 19th
Mayor of Jersey City, were great-grandsons of former Jersey City mayor
Cornelius Van Vorst. His maternal grandparents were Caroline Ely ( Milligan) Maxwell and Minister John Stevenson Maxwell (son of
Hugh Maxwell, the
New York County District Attorney and
Collector of the Port of New York under Presidents
Zachary Taylor and
Millard Fillmore). He attended
New York University School of Commerce. Hе was awarded an
LL.D. degree from
St. Lawrence University in 1934. ==Career==