Mr. Briggs was the father of Jerry Briggs, a friend of Bucky Barnes. He first appeared in Captain America #5 (1941).
Mr. Briggs was a security guard that was assigned to guard a ruby. He also did not believe that Captain America was real and told his son to quit the Sentinel of Liberty. However, one night two robbers attempted to steal the ruby but they were stopped by Captain America. Mr. Briggs then saw that Captain America was real and allowed his son to stay in the Sentinel of Liberty.