I worked at pfizer doing drug discovery for several years. Some of the guesses are surprisingly close.
A director isn't as high as you might think.
Assistant scientist <-- new B.S grad enters here
Sr. Assitant scientist
Associate scientist <-- new M.S grad enters here
Sr. Associate scientist
Scientist <-- new Ph.Ds enter here, leads 2 B.S, 1 M.S
Sr. Scientist <-- Ph.D w/ post-doc enters here
Fellow <-- leads 6 people, heads a "lead" compound/series
Sr. Fellow
Assistant Director <-- heads a non-major therapeutic area within a department, ~3 compound series, 20 or so people
Sr. Direct <-- heads a major or 2-3 non-major therapeutic areas (e.g CV, oncology), 40-60 people
VP of the department
President of the site
So Assistant Director makes ~$200K in salary, Sr. Director ~$250-300K. But that's not the potential total pay could be. There scientist and up has performance based bonus and stock options. Higher you go, those side pay becomes a much larger % of total potential pay. Of course when Pfizer stocks are tanking, those won't be worth the paper they are printed on.