Thomas Wenham was a merchant in the Province of New York in 1685. He was elected an alderman of New York in 1698 and was among a group of merchants who, in March 1700, petitioned the King to replace Governor Bellomont.
In June 1702, Thomas Wenham was appointed to the office of the Collector and Receiver-General, and on April 5, 1703, he was appointed Third Judge of the Supreme Court of Judicature. He was appointed to the Governor's Council in July of that year and died in 1709.
Hamlin, Paul M., and Charles E. Baker. Supreme Court of Judicature of the Province of New York, 1691-1704. New York, 1959.