With Alpha abilities that enable him to hide in plain sight, Kellerman is one of the most notorious intelligence gathering experts and thieves. Governments around the world consider him a menace and law enforcement agencies (including CLEA) have made him their most wanted since he has infiltrated various organisations and stolen evidence, compromising many high profile investigations. Usually the people that employ him are the same people that are being investigated so in the criminal underworld he is classed as a "fixer" because he can make most problems go away.

Incredibly at one time Kellerman was a well respected CEO of a small trading company. Having acquired a taste for the finer things in life when a rutheless takeover saw him lose everything Deiter was unable to accept downgrading his lifestyle. At the time he was well aware that he was an Alpha Superior and equally aware of his gifts but had chosen not to use them because he preferred to live his life normally.

Having witnessed the company he had built being snatched from his grasp changed him so in a fit of revenge he used his gift to steal from the very people that had stolen from him. However maintaining his lifestlye meant the money he had stolen did not last long so he started to offer his services out to those that would pay quite large cash sums. Naturally the types of people that accpeted his offer were criminal types but Deiter did not have a problem. He felt as the world had screwed him he was going to screw it back.

Despite his current occupation, Kellerman classes himself as a gentleman. On a personal level this means he will not dirty his hand by hurting people and so on many occassions he has lost potential clients because though he is suited for assassinations he refuses to carry out such work.