• by Wayne Friedman , June 25, 2010

TV brass played executive shuffle this week.

Bob Greenblatt, the brains behind Showtime's programming hits, such as "Dexter," "The Tudors" and "Weeds," is exiting the cabler and will be replaced by David Nevins, an Imagine TV executive who has guided "Parenthood," "Arrested Development" and "Friday Night Lights."

The news was first reported in Variety.

Greenblatt, who produced the Broadway musical "9 to 5" and the hit HBO drama "Six Feet Under," does not have another position lined up. But the Los Angeles Times says insiders believe he is on a short list to run NBC Entertainment when Comcast takes majority ownership.

Prior to joining Imagine in 2002, Nevins was executive vice president of programming at Fox and senior vice president of prime-time series at NBC.

As of March, Showtime has 18.1 million subscribers.

On the broadcast front, Univision, the Spanish-language media company, named Peter Walker president of Univision Local Media. Walker, a veteran Tribune Company executive, was most recently president of Auvergne Holdings, an investment firm that handles media and service portfolios. He will report to Joe Uva, CEO of Univision.

Univision Local Media, a newly created division, realigns all operations and sales for the company's 63 TV stations, 68 radio and interactive properties under one umbrella.

Uva stated that organizing local ops into a new unit would "provide seamless service to our local advertisers and identify new ways to grow our relationships with our clients and partners."

The company, which claims to reach 95% of U.S. Hispanic households, also announced that Joanne Lynch, president of the Univision Television Station Group, will retire at the end of August after 20 years of service.