1751 – Allen was born in Cornwall, Connecticut on April 21, 1751.
1776-1777 – Became a member of the Vermont Legislature. He designed the university seal of the University of Vermont and the Great Seal of Vermont.
1780 – He proposed to the Legislature a memorial for the establishment of the University of Vermont.
1795 – Went to France and bought 20,000 muskets and 24 cannon but he was captured at sea before he can reach Vermont.
1798 – Published his book entitled The Natural and Political History of Vermont.
1807 – Published his book entitled Statements Appended to the Olive Branch.
1814 – Died on January 7, 1814.