Richard Grieco started out as a model, then moved on to acting, spending two years honing his craft before his first audition, according to his official website. After a few guest spots (The Facts of Life, One Life to Live), he landed the role of Officer Dennis Booker, arriving at 21 Jump Street for season 3. Booker was the bad boy of the bunch; said badness earned him a spin-off, Booker, which featured motorcycles and larger guns.