[3] His sister Amelia Cooper (1830–1912) was married to Abram Stevens Hewitt (1822–1903), who also served as mayor of New York from 1887 to 1888.

[4] He was the grandson of John O. Cooper (1755–1838), a hatmaker who served in the Continental Army during the American Revolutionary War, and Margaret Campbell (1762–1841).

[3] He attended the New York public schools and Columbia College, afterwards entering the iron business with the aid of his father.

[9][self-published source] In 1890, Abram S. Hewitt partnered with Edward Cooper and Hamilton M. Twombly in forming the American Sulphur Company.

Together, they were the parents of two children, one of whom lived to maturity:[14] He died in New York City on February 25, 1905, and was buried at Green-Wood Cemetery in Brooklyn.