Peter White Television EditorEXCLUSIVE: Mark Itkin, former WME partner and a doyen of the international formats and unscripted world, has joined the board of Plimsoll Productions.Itkin, who is based in LA and New York, will work closely with CEO Grant Mansfield and VP, Production and Development Saul Goldberg as the Hostile Planet and Yellowstone Live producer focuses on the U.S.