Rebecca Tucker is scaling Green Mountain West, having been promoted to prexy of Craig Ferguson’s CBS TV Studios-based production shingle.

Tucker has been a right-hand lieutenant to Ferguson since she joined his camp in October 2008 as an assistant. She’s done everything from help edit his book “American on Purpose” to serving as road manager for his comedy tours.

Tucker’s promotion was a natural move after Ferguson’s previous exec, Tracey Pakosta, departed Green Mountain this month after nearly five years to take the reins of comedy for Universal Television (Daily Variety, Sept. 13).

After spending so much time with Ferguson in recent years, she has an innate sense of the kind of material he responds to.

“Getting to watch his comedy mind work every day has been more of an experience than I could ever have imagined,” Tucker told Variety. “I really want to help bring his brand to other areas of television.”

Among the CBS projects Green Mountain is shepherding is a romantic comedy from writer Ed Weeks and the Ferguson-hosted gameshow “Celebrity Name Game,” with Courteney Cox and David Arquette’s Coquette banner.

Tucker got her start in the publishing department at ICM in Gotham, and she worked as an assistant at Cruise/Wagner Prods. after relocating to L.A. When she first met with Ferguson, she was wary of becoming a celebrity’s assistant, but he quickly won her over.

“He’s the most supportive person I’ve ever worked for,” Tucker said. “It’s rare in my experience to find someone that I respect so much and who entertains me on such a regular basis.”

Ferguson and Green Mountain are repped by WME.