He attended University of Minnesota School of Dentistry and received his dental degree in 1893.
After that he continued practicing general dentistry in Green Bay, Wisconsin.
He eventually enrolled himself at Angle School of Orthodontia, where he was part of first graduating class in 1900.
In addition, Pullen was an orthodontic professor at University at Buffalo School of Dental Medicine from 1919 to 1934.
[4] Pullen also wrote a chapter in a book about operative dentistry written by C. N. Johnson in 1912.