Norwood Penrose Hallowell.

About Norwood Penrose Hallowell

Norwood Penrose "Pen" Hallowell was an officer in the Union Army during the American Civil War. One of three brothers to serve with distinction during the war, he and his brother Edward Needles Hallowell both became commanders of the first all-black regiments. He is also remembered for his close friendship with and influence upon future Supreme Court justice Oliver Wendell Holmes Jr., who was his classmate at Harvard and his comrade during the war.