
He is pulled deeper into the illicit drug trade, becoming more and more ruthless as the series progresses, and later adopts the alias "Heisenberg", which becomes recognizable as a kingpin figure in the Southwestern drug trade. After this discovery, Walt resorts to manufacturing and selling methamphetamines with a former student, Jesse Pinkman ( Aaron Paul), to ensure his family's financial security after his death. On his 50th birthday, he is diagnosed with Stage IIIA lung cancer. Walt subsequently moved to Albuquerque, New Mexico, where he became a high school chemistry teacher. Soon afterward, the company made a fortune, much of it from Walt's research. He left Gray Matter abruptly, selling his shares for $5,000. Within the series, Walt is a chemist and graduate of the California Institute of Technology, who co-founded the company Gray Matter Technologies. Cranston contributed greatly to the creation of his character, including Walt's backstory, personality, and physical appearance.

Although AMC officials initially hesitated to cast Cranston due to his previous comedic role on Malcolm in the Middle, Gilligan cast him based on the actor's past performance in The X-Files episode " Drive", which Gilligan wrote.

The character is portrayed by Bryan Cranston. Walter Hartwell White Sr., also known by his drug-lord alias Heisenberg, is the protagonist of the American crime drama television series Breaking Bad. 308 Negra Arroyo Lane, Albuquerque, New Mexico, United States
