He works for The Stiletto. He is known for having an AppleBerry cellphone full of "incriminating evidence". He is believed to have gone into small periods of hallucination.
His first job was a paper boy, but was later initiated into the criminal underworld by and unknown agent employed by The Stiletto. Mr. Grote secretly sent over spies to watch his activity, and if he failed, to assassinate him. Derk was later arrested after the Green Ring was caught. He might be brought back in Album 59 where Buck Oliver and Mr. Skint are supposedly brought back.