"... the Ministry has now [passed] Educational Decree Number Twenty-three, which creates the new position of Hogwarts High Inquisitor. This is an exciting new phase in the Minister's plan to get to grips with what some are calling the falling standards at Hogwarts. The Inquisitor will have powers to inspect her fellow educators and make sure that they are coming up to scratch. Professor Umbridge has been offered this position in addition to her own teaching post and we are delighted to say that she has accepted."
-- from the Daily Prophet's account (OP15)
The Daily Prophet reports that this position was offered to Dolores Umbridge, who happily accepted the post in addition to her teaching duties.