He was the son of Benjamin Harrower. The family removed to Lindley when Gabriel was still a child. He attended the common schools and Geneva Lyceum. Then he engaged in farming and the lumber business.
He joined the Free Soil Party in 1848, and the Republican Party upon its foundation. He was Sheriff of Steuben County from 1853 to 1855; and Supervisor of the Town of Lindley. On November 5, 1859, he married Helen Parkhurst (1837–1911), and they had several children.
He was buried at the Cemetery in Lawrenceville, Pennsylvania.
- The New York Civil List compiled by Franklin Benjamin Hough, Stephen C. Hutchins and Edgar Albert Werner (1870; pg. 552)
- Life Sketches of Executive Officers and Members of the Legislature of the State of New York by William H. McElroy & Alexander McBride (1873; pg. 71f) [e-book]
- Obit transcribed from the Wellsboro Gazette of August 22, 1895
|New York State Senate|
Theodore L. Minier
| New York State Senate
George B. Bradley