In the novel do we get an explanation on how the director obtained their power / how he got the position of being a director

Mustapha Mond gave up his career as a brilliant scientist to train for a job as World Controller. Instead of making scientific discoveries, he censors them. Once an avid reader, he turns his head and embraces a world that oppresses free thought. In the end, you have to believe that he was won over by the old..... if you can't beat them..... join them.