Executive Producers

An executive producer is the senior above the line talent on an episode, and is in overall charge of any episode's production.

Overview
Until 1998, executive producers were largely uncredited, because the Head of Serials (or the Head of Series and Serials) was the uncredited executive producer of not only Doctor Who, but all programmes in the department. The only exception was season 18. For that year, the incoming Head of Serials asked Barry Letts to do the job for him on Doctor Who and oversee John Nathan-Turner's first year as producer.