1797 – Allen was born in Worcester, Massachusetts on August 9, 1797.
1809-1811 – Attended the Leicester Academy.
1811-1812 – Attended Yale College and afterwards studied law.
1818 – He was admitted to the bar and after passing the bar he praticed his career at New Braintree.
1824 – Returned to Worcester and continued his career.
1830-1835 – Became a Member of the Massachusetts House of Representatives.
1836-1837 – Rendered service in the Massachusetts State Senate.
1842-1845 – Became a member of the Northeastern Boundary Commission and judge of the Court of Common Pleas.
1848 – He was a delegate to the Whig National Convention at Philadelphia.
1849-1853 – Elected as the Free-Soil Party candidate to Congress.
1859-1867 – Became Chief Justice of the Sufolk County Superior Court and was a delegate to the peace convention held at Washington, D.C..
1869 – Three days before his 72nd birthday, he died in Worcester on August 6, 1869.