WARNING SPOILERS
Henry R. "Hank" Schrader is Walter White's brother-in-law and the husband of Marie Schrader. He is an agent of the Albuquerque office of the Drug Enforcement Administration, who leads the investigation of the methamphetamine cook "Heisenberg", and also investigated Gustavo Fring's drug empire. He is faced with numerous threats from the rival drug cartels which take a toll on Hank's mental health. Despite his brashness, Hank is highly competent at his job, and cares about his family.
Background information
Hank was born somewhere between March 13–28, in 1966. Little is known about Hank's early life. He met Marie in high school and asked her out repeatedly until she finally agreed. Hank joined the DEA in the late 1980s and befriended Steven Gomez at some point, and married Marie in 1998. Shortly before he married Marie, Hank informed his brother-in-law, Walter White, about the affair. Walt told Hank to simply forget about it and that it wasn't an affair, and Hank chose to take his advice.