Born: Jan 1, 1856, Chesterville, Ohio.
Died: March 17, 1921, Chicago, Illinois.
Buried: Forest Home Cemetery, Forest Park, Illinois.
Frank was the son of Joseph Gunsaulus and Mary Hawley, and husband of Georgiana Long.
He was educated at Ohio Wesleyan University, Delaware, Ohio. After graduating in 1875, he was ordained a Methodist minister, and was a circuit rider for several years.
In 1879, he entered the Congregational ministry and became pastor of the Eastwood Congregational Church, Columbus, Ohio, serving there until 1881. He went on serve pastorates in Newtonville, Massachusetts (1881–85) and at the Brown Memorial Church, Baltimore, Maryland (1885–87).
In 1887, Gunsaulus was called to the Plymouth Congregational Church, Chicago, Illinois. While in Chicago, he was a driving force in the establishment the Armour Institute of Technology in 1893 (now the Illinois Institute of Technology), and was its first president.