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New Shine Group Americas CEO Emiliano Calemzuk is shaking up Reveille, leading to the exit of co-managing director Mark Koops.

As part of the exec shuffle, Howard T. Owens, who had shared the title with Koops, will now serve as Reveille’s sole managing director. He’ll oversee the company’s day-to-day operations, reporting to Calemzuk.

Also, Calemzuk has named Robin Ashbrook to a newly created position as head of nonscripted entertainment at Reveille.

Calemzuk wasted no time in making his first moves at Shine. The exec officially just joined the company, run by CEO-chair Elisabeth Murdoch, in mid-September.

Calemzuk announced his move to Shine from Fox TV Studios, where he had served as president since 2007, last month. He now oversees all Shine operations in the Americas — including Reveille, the L.A.-based shingle responsible for hits like “The Office” and “The Biggest Loser,” as well as this past summer’s “Masterchef.”

“This is a restructure that will equip Reveille for the next period of its growth,” Calemzuk said, referring to the shakeup as a “streamlining” of company management.

Koops had been with Reveille since Ben Silverman launched the company in 2002. When Silverman left for his NBC gig in 2007, Koops, Owens, Chris Grant and Lee Rierson were all named as managing directors to jointly run the company.

That setup continued after Shine bought the company in 2008, although Grant now runs Shine Intl., the company’s distribution arm.

Rierson, meanwhile, keeps the title of managing director of business affairs, but will now report to Owens. That leaves Owens, who has also been with Reveille since the start, as the company’s sole leader.

Meanwhile, the new setup also now makes it a bit more clear who handles which facet of development. As Ashbrook oversees nonscripted fare, Carolyn Bernstein, whom Murdoch brought to Reveille in 2008, continues as head of scripted programming.

Ashbrook, who has been serving as an exec producer on Reveille’s “Masterchef,” joined the company a year ago from U.K. sister Shine TV.

While at Reveille, Koops co-created and exec produced “The Biggest Loser.” He also was an exec producer of “American Gladiators,” “Nashville Stars” and “Shear Genius.” He joined the company from William Morris.