Gardenier was was a native of Ulster County, New York and after receiving a liberal education, studied law at Litchfield Law School, Connecticut in the class of 1796 being admitted to the bar afterwards.
Gardenier was was a native of Ulster County, New York, and was baptised on July 26,1776 in the Kinderhook, New York Reformed Dutch Church. He received a liberal education, studied law at Litchfield Law School in Connecticut and was admitted to the bar afterwards.