Columbia Entertainment: Larry Johnson has been promoted to casino general manager for the Tropicana Resort and Casino in Las Vegas. He recently held the same position for the company's Laughlin, Nev. property, River Palms Resort & Casino. Johnson is the 32nd general manager to be named in the 50-year history of the Tropicana. He has held many executive positions with other gaming outlets. Johnson's career includes time at Harrah's Las Vegas, Mirage Resorts, Black Hawk Gaming & Development and Ameristar Casinos