Nissa Diederich Named 20th Television Exec VP of Production, Jim Sharp to Depart Elaine Low, provided by FacebookTwitterEmail Nissa Diederich, most recently the executive vice president of production for Touchstone Television (formerly Fox 21 Television Studios), has been named head of production at 20th Television in the wake of the consolidation of the Walt Disney Company’s TV studios. Longtime production executive Jim Sharp, who had served as 20th’s production head and spent decades at the company previously known as 20th Century Fox, will depart the studio at the end of the year after assisting with the transition. Known as a smart, seasoned executive, Sharp’s oversight on productions at Fox dates back to shows such as “Malcolm in the Middle” and FX’s “The Shield.”