ER executive producer Neal Baer has quit his post at NBC's top-rated drama and has joined the network's Law & Order: SVU. Citing creative differences, Baer — who has been with ER since its inception — said he is leaving on good terms. "I have the utmost affection and admiration for the cast and crew. But I've been there for seven years," he tells Variety. "I felt it was time to move on." Baer will serve as executive producer and headwriter on SVU.