Away from Marvel, Senior worked on The Spiral Path in Warrior #3, and drew various episodes of Judge Dredd, Harlem Heroes, Tharg's Time Twisters and Tharg's Future Shocks for 2000 AD, as well as Judge Dredd, Lawman of the Future and the Judge Dredd Yearbooks.
Since the late 1990s, Senior has worked mainly in advertising. He has returned to comics on occasion, mostly for Transformers-related projects, and for online comic To The Death. Simon Furman describes Senior as having "that Jack Kirby-esque trait of just making even the quieter moments seem dramatic and full of a kind of coiled energy and tension." (Judge Dredd Megazine #380.)