Upon graduation from the Wisconsin School of Electronics, Tallman wrote technical manuals for Piper Aircraft in Lock Haven.
Tallman later worked in several computer, engineering, and management positions for several companies in Pennsylvania.
He was most recently self-employed performing computer networking and telephone line improvements for several small businesses in the Hanover and Gettysburg areas.
In April 2009, Tallman was appointed to one of four seats on an Immigration Task Force developed by the Intergovernmental Affairs Committee of which he is also a member.
The main purpose of the task force is to evaluate House Bill 1184 which was proposed by Harry Readshaw in order to tighten up citizenship regulations.