He entered Cornell University, Ithaca, New York, in the class of 1873, where he was a member of Kappa Alpha Society.

After the end of his junior year at Cornell, Dunwell entered Columbia Law School in the city of New York, and graduated in 1874.

[citation needed] He was admitted to the bar in 1874 and commenced practice in New York City.

[citation needed] Dunwell was elected as a Republican to the Fifty-eighth, Fifty-ninth, and Sixtieth Congresses and served from March 4, 1903, until his death in Brooklyn, New York, June 12, 1908.

This article incorporates public domain material from the Biographical Directory of the United States Congress