 However, to Knapp's "eternal shame," he also during this era publicized the claims of conspiracy theorist Bill Cooper, whom Knapp came to regard as far less credible than Lazar.In 1991, Knapp left KLAS to work for Altamira Communications, a public relations firm whose clients included advocates of the Yucca Mountain nuclear waste repository north of Las Vegas.Knapp was rehired by KLAS-TV in the mid 1990s when he left the public relations firm.