Longtime Charter Communications executive David Ellen, who helped guide the cable operator’s restructuring after its $79 billion acquisition of Time Warner Cable, will be stepping down in December and transitioning to an advisory role, the company announced Monday.

Ellen, 58, has been serving as senior executive vice president. He joined the company in 2016 from Cablevision, where he was general counsel, following that cable powerhouse’s $17.7 billion sale that year to the French telecommunications giant Altice.