[3] Halsey began his business education in the counting-room of Messrs. Isaac Moses & Co., before deciding to focus on banking.

[4] Following the death of John Oothout in 1858, Halsey was elected to succeed him as President of the Bank of New York.

His resignation was accepted on the 14th, and Charles P. Leverich was elected to fill the vacancy.

[5] Together, they were the parents of:[5] He was "prominent in the development of the public-school system" of New York City and served as an elder of the Pearl Street Presbyterian Church and the Central Presbyterian Church in New York City.

[1] Through his son James, he was a grandfather of Anthony Post Halsey II (1845–1910), a merchant who moved to California and married Emma Eugenia Vail (sister of Theodore Newton Vail and niece of John Alonzo Quinby, the 13th Mayor of San Jose, California, and Brig.-Gen. Isaac Ferdinand Quinby).