Zoom (real name Hunter Zolomon) is a fiction comic book supervillain from the DC Comics universe. He is primarily associated with the superhero Wally West, the third Flash and is the third of the Reverse-Flash. As Hunter Zolomon, he first appeared in The Flash: Secret Files & Origins #3 and was created by Geoff Johns and Scott Kolins.
Hunter Zolomon had a troubled relationship with his parents, who rarely spoke to each other or to him. On the day Hunter was to leave for college, he came home to find the police laying siege to his house. His father was a serial killer who had killed six young girls, and when his mother told the police, his father murdered her, and was subsequently killed by the police after refusing to give up.
Hunter became obsessed with understanding the criminal mind to stop people like his father, studying psychology and criminology in college, then joining the F.B.I. along with his girlfriend Ashley, whom he later married, specializing in low-level costumed criminals. One case resulted in Ashley's father being killed (Hunter had thought the criminal they were after was incapable of facing his adult life, and thus would not use an 'adult' weapon such as a gun). Ashley left him shortly thereafter, and the F.B.I. terminated his employment. Hunter was also left with a damaged knee due to the case, requiring a cane for walking and unable to ever run again.
After arriving in Keystone City, he got a job as a profiler, working with the police in their Department of Metahuman Hostilities. His work put him in constant contact with the Flash, Wally West, and the two became good friends. His insight was critical in solving a number of cases, but he always resented being stuck behind a desk.
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Official Site: DC Comics
Links: Zoom Wiki Hyperborea entry DCUGuide entry