Shameem Haider was given the charge in his place, an official release said here.
The move was preceded by a recent Jharkhand High Court directive to the state government to remove Choudhary as the director of RIMS.
The HC had issued the order after receiving a PIL concerning Choudhury.
The new incumbent, Haider, has been given the charge of RIMS Dean as well, the official release further said late tonight.