AMC Networks has promoted Joel Stillerman to president of original programming and development for AMC and sibling channel SundanceTV.

The move follows the promotion of Charlie Collier to president and g.m. of AMC and SundanceTV. Stillerman had been expected to add oversight of SundanceTV to his AMC duties. AMC PR vet Marnie Black has been promoted to exec VP and adds oversight of public relations for SundanceTV.

“The new management structure for AMC and SundanceTV acknowledges the outstanding contributions of a dynamic and proven leadership team and positions both networks for continued success,” Collier said.

Another AMC vet, Jan Diedrichsen, has been named exec director of SundanceTV, tasked with expanding the channel’s brand across multiple platforms. He had been senior VP of affiliate marketing.

“Joel has had a meaningful impact on the growth and evolution of AMC, and SundanceTV will benefit from his programming expertise and leadership. Jan is a seasoned and talented executive, and his role will be critical to the ongoing growth and development of SundanceTV as a network, a brand and a business,” Collier said.

Stillerman has been with AMC since 2008. He’s steered the development of “The Walking Dead” and its upcoming spinoff “Fear the Walking Dead,” “Better Call Saul,” “Hell on Wheels” and other series for the cabler.

(Pictured: Joel Stillerman, Jan Diedrichsen, Marnie Black)