when was he appointed for that job title mentioned?
In 1198.
Hugh de Neville
Neville was appointed as Chief Forester under King Richard I in 1198. 
who is hugh de neville? Chief Forester of England. what's his date of birth? UNANSWERABLE
wiki:7833245
Hugh de Neville [SEP] Chief Forester
Neville was appointed as Chief Forester under King Richard I in 1198. As the official in charge of the royal forests, he held one of the four great offices of the state: the others were the justiciar, the chancellor, and the treasurer. The forester was responsible for enforcing the forest law – the special law that applied to the royal forests – and presided over the forest justices, who held forest eyres. There was also a special forest exchequer, or forest treasury. In 1198 Neville presided over an Assize of the Forest that was described by the chronicler Roger of Howden as greatly oppressive.