Marcus Wallace

Professor Marcus Wallace is a professor-turned-hunter on an unnamed university at San Fransisco. He is the expert that Sam and Dean visit when they need help finding information on a Doragon Kokoro, in order to slay The Heart of the Dragon.

History
No much known about his life. The only known is he somehow involved in hunting and befriended some Hunters, including John Winchester and Bobby Singer in the past. In 1989, John and Bobby entrusted him for Doragon Kokoro safekeeping.

Supernatural: Heart of the Dragon
In 2009, the Winchester tracked the sword location and coincidentally met professor Marcus Wallace, after the latter got a heart strike in a hospital. Marcus Wallace, realizing the both of them are the Winchesters and son of John, he recounted his experience with John and Bobby in the past. He later decided to lend them the sword.

Apppearance

 * Supernatural: Heart of the Dragon