David Clark has been named prexy of the Weather Channel. He ov ersees programming, strategy and operations for the Atlanta-based company. Clark comes to the cabler from Madison Square Garden, where he was exec ve ep.Bender/Helper Impact has tapped Nicole Rodrigues as VP of entertainment content. Rodrigues comes to the praisery from Miller PR, where she was director of digital entertainment. Gregg Liebman has joined Telemundo Media as senior veep of advertising sales insights and strategy. Liebman had been a senior veep at Turner Broadcasting. Mike Iverson has joined Ryan Seacrest Prods. as senior veep of sales and corporate partnerships. Iverson had been national account manager for Premiere Networks.