Gregory Johnson has joined NBC Cable Networks as director, central region ad sales. He had been vice president, sales, Western region at Courtroom Television Network. Deborah Malone has joined CNBC International as vice president of advertising sales. Malone had been managing director of Advertising Age International. David Bittler has joined CNBC as director of communications. He had been director of editorial and special projects at Cable News Network. Jill Grinda has joined CNBC Europe as network manager, southern Europe. Grinda had been a producer for Bloomberg Television's French service.