Originally Posted by MachineCult
His history is explaind in the Visual Dictionary and (I think) Labyrinth of Evil (which I haven't read and don't really plan to). He was "trained in the Jedi arts" meaning he was taught how to fight with Lightsabers and some tips on what a Jedi might do in combat... all by Count Dooku. But Grievous was not force sensitive. He was not a Jedi or Sith. Dooku just gave him some saber lessons, basically. The Clone Wars series also picks up on that idea, and shows them sparring.