Susan Credle has been promoted to ECD at BBDO/N.Y. ... Sound design company The Penthouse launched yesterday at 240 Madison Avenue under the creative guidance of sound engineer John Grant. The address is also home to mad.house's postproduction facilities, and the two companies plan to work together to offer a range of postproduction services. ... Thea Slevin, formerly senior TV producer at Clemmow Hornby Inge in London has resigned to join Mother/London. She will start in January. ... Rhinoedit has signed two editors to its roster. Sven Herrmann formerly cut in Mexico and South America, while Daniel Rezende is known for his work on the features City of God and Motocycle Diaries. ... Director Maxime Giroux has signed to Toronto-based Fever Films for commercial representation. ... Josh Thacker, formerly an assistant editor at Fischer Edit in Minneapolis, and Quan Tran, formerly an assitant at Mad River Post in Dallas, have been promoted to editor.