Career

Bancker was the son of Gerard Bancker Senior and Maria de Peyster, who had married in New York City in 1731. In 1774, as city surveyor, he made a map of Saint George"s Ferry on Nassau Island. He was Deputy Treasurer from 1776 to 1778, and New York State Treasurer from 1778 to 1798.

He collected a large number of broadsides from the revolutionary era which were sold at auction in 1898 in Philadelphia.