Hiram Gregory Berry was born on August 27, 1824, on his parents' farm in the Meadows of
Thomaston (now the
City of Rockland),
Maine. He was the fourth child of Frances Gregory Berry and Jeremiah Berry. He had 3 brothers and one sister. Hiram G. Berry was born in
Rockland,
Maine, where he worked as a
carpenter and a navigator. He served several terms in the
State Legislature and subsequently became the mayor of Rockland. He also originated and commanded the "Rockland Guard," a volunteer
militia company, which held a reputation for drill and discipline. On April 21, 1852, Hiram co-founded the Rockland Steam Manufacturing Company along with I. K. Kimball, A. H. Kimball, and Joseph C. Libby. The company created doors, sashes, and blinds. On October 19, 1857, after its president Knott Crockett died, he assumed presidency of the bank. He resigned from his position to enter the army on June 5, 1861. ==Civil War service==