The first Black college professor in the United States. Freeman was appointed to the faculty of the Allegheny Institute in Pittsburgh where he served as a professor and administrator.

Eventually the racism in Pittsburgh (this is the mid 1800s ya know) grew to be too much for him and he joined the repatriation movement of Martin Delany. Freeman relocated to Liberia in 1863 to become a professor at Liberia College. He taught there for about 25 years and eventually became the president.