|This article is about the NYPD detective. For the mercenary, see Alan "Dutch" Schaefer.|
Shaefer was granted American citizenship in 1975, joined the NYPD in 1978, and made Detective in 1986. He is fluent in English, French and Russian.
This began when he faced a Predator who was interrupting a gangwar in New York City in the summer of 1989. He traveled back to Val Verde to try and find out more about his brother and fought another Predator there. And eventually faced a fleet of Predator ships over New York City in a street battle with gang-members, police, military and the aliens.
In 1990, he fought Predators again when the government flew him to Siberia to track down a damaged Predator ship that crashed there.
In 1996, Schaefer returned again to Val Verde searching for truth about what happened to his brother and again faced the Predator he thought he had killed there seven years earlier.
- Schaefer has been the lead character in three Predator comics miniseries, including the first ever Predator comic from 1989. The series was also adapted into a novel under its collected title Predator: Concrete Jungle, starting the Predator novel series. He then starred in the sequel series Predator: Cold War (1990), and Predator: Dark River (1996).