Walter Hartwell White (also known by his clandestine alias Heisenberg) is a fictional character. The main protagonist, and anti-hero, in the American television drama series Breaking Bad on AMC. He was created by series creator Vince Gilligan and is portrayed by Bryan Cranston. A graduate of the California Institute of Technology, Walt was once a promising chemist who was one of the founders of the multi-billion dollar company Gray Matter Technologies. He abruptly left the company, selling his shares for $5,000, and subsequently moved to Albuquerque, New Mexico to become a high school chemistry teacher. After being diagnosed with Stage IIIA lung cancer, he resorts to manufacturing methamphetamine and drug dealing to ensure his family's financial security after his death. Walt's evolution from mild-mannered school teacher and family man to ruthless criminal mastermind and murderer is the show's central focus.