The recently departed drama and comedy development chiefs at Warner Bros. TV have rejoined their former boss Leslie Moonves in two newly created positions at CBS Prods.Maria Rastatter has been named senior vice president of comedy at CBS Prods., and Nina Tassler has been named senior vice president of drama at the division. Rastatter was previously the senior VP of comedy development at Warner Bros. TV, and Tassler was senior VP of drama development. Separately, Warner Bros. TV named Tassler’s replacement: Steve Pearlman, who will add the chief drama development post to his duties as head of current programs. At CBS Prods., both Tassler and Rastatter will report to Moonves, president of CBS TV, and Nancy Tellem, another recent hire from Warner Bros., who now holds the dual role as executive VP of CBSP and exec VP of business affairs at CBS Entertainment. All three execs worked for Moonves when he was president of Warner Bros. TV. Tassler’s appointment had been expected for some time, but Rastatter’s deal came together more recently. While at Warner Bros., Tassler was instrumental in the development of TV’s top drama “ER,” while Rastatter was a key player in developing “Friends” and “The Drew Carey Show.” Now that Moonves has added responsibility for the network’s syndie wing Eyemark Entertainment to his duties, he’s hoping to pump up CBS Prods. and build what he calls a “mini-studio.” All of the networks are, in fact, placing more emphasis on inhouse production now that federal rules preventing them from owning and syndicating their primetime series have been eliminated. Tassler first joined Warner Bros. (what was then Lorimar TV) in 1990 as a director of movies and miniseries after working as a director of TV and motion picture administration for Triad Artists Inc. She also worked at Triad as talent agent overseeing the TV talent department, and also at the Irv Schechter Co., where she repped playwrights and oversaw the talent department. Rastatter began her career in the casting department of Witt-Thomas-Harris Prods., where she helped cast “The Golden Girls” and “Webster.” She also worked for GTG Entertainment and Paramount Network TV as a director of development before joining what was then Lorimar in 1992 as a director of comedy development.