Two stalwart Warner Bros. TV execs are taking on expanded responsibilities at the studio’s Warner Horizon cable production unit.

Susan Rovner and Brett Paul have been named co-presidents of Warner Horizon Scripted Television. The pair will work alongside Mike Darnell, who oversees all unscripted programming for Warner Horizon and Telepictures Prods.

The promotion means double duty for the duo, who will continue to in their existing roles as exec VPs at Warner Bros. TV, reporting to WBTV Group prexy-chief content officer Peter Roth.

Rovner oversees development for WBTV and now Warner Horizon Scripted; Paul is WBTV’s top exec overseeing business and production matters. The added duties for the two execs come after Warner Horizon exec VP Craig Erwich opted to step down at the end of his contract. With the growth of Warner Horizon and the migration of talent across network and cable boundaries, Roth said it made “perfect sense” to align all studio scripted operations under Rovner and Paul.

“Susan is one of the brightest and most accomplished development executives in the entertainment industry, possessing outstanding creative judgment and the innate ability to elicit an artist’s best work through collaboration. Brett’s skills as a top negotiator and strategic business advisor have proven invaluable to the success of Warner Bros. Television for nearly 20 years,” Roth said. “Together, they form a true creative and business dream team to co-run Warner Horizon Scripted Television.”

The division’s scripted production has grown exponentially since Erwich joined the fledgling operation from Fox in November 2007. The active roster includes TNT’s “Rizzoli & Isles” and “Dallas,”ABC Family’s “Pretty Little Liars,” A&E’s “Longmire” and TBS comedies “Ground Floor” and “Sullivan and Son.” And Lifetime recently gave a series pickup to drama “The Lottery.”

Rovner has been with WBTV since 1998, and was most recently upped to exec VP in 2010. Paul joined the studio in 1995 and was upped to exec VP in 2008.