Abraham Erskine was a Jewish doctor, most known for the creation of the Super-Soldier Serum. Born in Germany, he defected to the United States following the rise of Nazism, and continued to work on his research. After being offered a contract by the United States Army, Erskine tested his serum on Steve Rogers, turning him into Captain America. But just as his work had finally been realized, Erskine was fatally shot by a HYDRA agent.