George A. Halsey began his career in Newark, New Jersey, after moving there in 1840. He joined the family business, Samuel Halsey & Sons, at age 19, gaining early experience in the industry. Halsey transitioned into public service, serving in the New Jersey General Assembly and as the United States assessor of internal revenue. He was elected to the United States House of Representatives twice, where he chaired the Committee on Public Buildings and Grounds. After his political career, Halsey returned to the private sector, leading a manufacturing firm and an insurance company.

George A. Halsey's political career is marked by a blend of fiscal conservatism and unexpected alliances, particularly on environmental regulations, suggesting a calculated strategy to safeguard regional industrial interests. His legislative record reveals a surprising convergence with opposing factions, hinting at an ideologically agile approach. Halsey’s rhetorical style is notably understated, often framing complex issues in a manner that de-emphasizes partisan conflict.