In the 1990s, Mimi Leder was a formidable name in television. As a producer and director on the military drama China Beach and the smash hit ER, she helped invent a more robust, cinematic form for a medium that had long existed in the shadow of feature films. Landmark ER episodes like “Love’s Labor Lost” and “The Healers” proved that TV could tell compelling stories on a scale that felt dynamic and epic, using long Steadicam shots and hefty effects budgets to pack a visual punch. So it was no surprise when Leder moved on to film, directing the blockbuster action movies The Peacemaker (1997) and Deep Impact (1998).