Harold B. Wallack (1854-1906) was a charter member of The Lambs, joining in 1877.
He was born in November 1854 in New York. He was the youngest of the three sons of Shepherd John Lester Wallack, actor-manager. His brother Arthur J. Wallack (1874-1940) was one of the six founders of The Lambs; his father was the second Shepherd (president) of the Club.
Harold Wallack studied medicine and dabbled in acting.
In November 1884 he married Maggie Fling, of Philadelphia, in a secret wedding. They had three children, two daughters and a son.
Harold B. Wallack died September 29, 1906, of gastritis in Long Branch, New Jersey. He is interred in the family plot in Green-Wood Cemetery, Brooklyn.