After what has been years of speculation, Viacom today announced that veteran Judy McGrath is resigning from her position as Chairman and CEO of its MTV Networks. McGrath, who had been at MTV almost from the beginning, starting as a copywriter at the music channel in 1981, was named Chairman and CEO of MTV Networks in July 2004 by then-Viacom co-president and co-COO (and McGrath mentor) Tom Freston to whom she reported.