Beggs, who achieved All-America honors in lacrosse three years, played second attack for Yale. He won first team All-America honors in 1931 and 1932, and second team honors in 1930. He was captain of the freshman team as well as the varsity. In addition to his lacrosse accomplishments at Yale, he also was a member of the freshman basketball team and was captain of the class basketball teams of 1930, 1931 and 1932.
While at Brooklyn's Manual Training High School, Harry participated in a variety of activities in addition to lacrosse -- he was a member of the 1926 undefeated championship football team, a member of the basketball team, president of the Student General Organization, editor-in-chief of the school paper, and president of Arista -- the Student Scholastic Honor Society.
His business interests after college took him from Tlatley, Mexico, where he was the treasurer of the St. Elmo Mining and Manufacturing Company, to New York City as a management consultant with Stevenson, Jordan and Harrison. He also lived in Indiana, first as the vice president of the National Automatic Tool Company and later as president of B-H Metal Fabricators. He returned to New York City again as a management consultant with Cresap, McCormick and Paget, then became vice president of the International Telephone and Telegraph Corporation. His last job was owner of his own company - Beggs Associates in Weston, Conn.