Longtime ufologist James W. Moseley illustrated the ambivalence many UFO researchers feel about Klass. On the one hand, Moseley argued that Klass was sincere in his motives and that his work ultimately benefited the field of Ufology. In his memoirs, Moseley contended that, when pressed, most leading ufologists would admit that Klass knew the subject and the people involved and was welcomed, or at least pleasantly tolerated, at UFO meetings. However, Moseley also wrote that he and Klass "have had and continue to have intense doctrinal and factual disagreements, and there are things about Phil's 'style', like his attack on James E. McDonald, that I do not admire or agree with." In a 1999 interview, fellow debunker Gary Posner wrote that despite some recent health problems, the 80-year-old "Klass's mind—and pen—remain razor sharp, to the delight of his grateful followers and to the constant vexation (or worse) of his legions of detractors."