Professor Samuel Oak is a Pokemon Professor who lives and works at his research lab in Pallet Town in the Kanto region.
Professor Oak is one of the world's greatest Pokemon Professors and is also very familiar with the Professors of other regions. He is the grandfather of Gary Oak and in his youth Professor Oak was a skilled Pokemon trainer.
Professor Oak is responsible for giving the Kanto starter Pokemon (Charmander, Squirtle and Bulbasaur) to new Pokemon trainers every year. Ash Kechum received his Pikachu from Professor Oak.
In the English dub of the Pokemon anime series, Professor Oak was originally voiced by Stan Hart in the 4Kids Entertainment version.
After 8 seasons of Pokemon 4Kids lost the anime license to Pokemon USA. With a new English dub Professor Oak was then voiced for all future appearances by former 4Kids voice actor Jimmy Zoppi who is credited as Billy Beach, after he successfully auditioned for the Pokemon anniversary special; Mastermind of Mirage Pokemon.
In the Pokemon Origins TV Special Professor Oak was voiced by Kyle Hebert.