Lionel Derrick is the house name, or pseudonym, for Mark K. Roberts and Chet Cummingham while writing the Penetrator series for Pinnacle Books. Roberts wrote the odd books and Cummingham the even ones.
For what it is, it's well done. The most interesting plot element is a rural mountain community in California that's been taken over by a band of neo-Nazis. They drug the water supply to keep everyone in the town compliant and subservient (could this explain Trumpism?). The Penetrator arrives, kills a lot of bad guys, and then gets himself implanted at San Quentin to finish the job. It's as predictable as you'd expect, but it moves along rapidly.
Another men's adventure series from the 70's. Pretty much standard action, violence and sex. However a good standout is that the hero is healed and trained by an old Cheyenne Indian in the ancient mystic warrior ways of the Cheyenne. Recommended