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Seth Kalichman, professor of social psychology at the University of Connecticut, has decried Null's role as a prominent proponent of AIDS denialism and has accused him of cashing in on HIV/AIDS; in Kalichman's 2009 book, Denying AIDS, he compared Null's activities to Holocaust denial and described Null as an example of a dangerous entrepreneur who "obviously breached" the balance between free speech and protecting public health.