Henry Glen was baptized July 13, 1739 in Schenectady, N.Y. He had one brother, John. The brothers formed a trading company with Jacobus Teller, which they ran for some time before the American Revolution. At the age of 28, Mr. Glen began his political career with an appointment as clerk of Schenectady county, a position in which he served until 1809.
During the Revolution, Mr. Glen was active on the side of the colonists, serving as a member of the first three Provincial Congresses and as a member of the Committee of Safety. He was a captain in the second company of militia for Schenectady County, although he did not serve in that capacity. Mr. Glen's chief position during the War for Independence was deputy quartermaster general. As such, he was in charge of all stores for Schenectady, and communicated with a number of important persons within the young nation, including Governor George Clinton of New York and General George Washington.
After the war, Mr. Glen continued to pursue an active role in state politics, first as a state assembly member (1786-1787, 1810) and later as a representative in the U.S. Congress (1793-1801). While he had no official political party membership, Mr. Glen sided with the Federalists when the Republicans began to grow in strength. Although Mr. Glen's official position of deputy quartermaster general was a wartime appointment, he remained involved with the movements of supplies to troops in New York state throughout his time in Congress.
Much less is known of Henry Glen's personal life. At some point before or during the Revolution, he married. Two children were born of the marriage, John Visscher and Catherine. Mr. Glen was also related to Andrew Cornelius Cuyler, the former royal mayor of Albany, who married Jane Elizabeth (Janetie) Glen, possibly Henry's sister.