 In the mid-1970s, Katz was invited to enroll at the University of Lancaster in England, where his academic interests and expertise coalesced in the application of mathematics and psychometrics to the study of psychophysiology and genetics via sophisticated instrumentation which he designed and built.Katz's graduate studies were interrupted by an extended critical illness during which time he returned to his family home in the U.S.In 1983, Katz received a Ph.D. from the University of Lancaster, England, under the mentorship of both Phillip Levy, Chair of Lancaster's Psychology Department, and Hans Eysenck, psychometrician and founder of the Psychology Department at the University of London.