fifty years later he documented that a luncheon conversation with Leó Szilárd, the nuclear physicist, led to the concept and physical setup for the first clonogenic assay. Dr. Marcus then spent nine years on the faculty of the Albert Einstein College of Medicine in NY supported by a ten-year U.S. Public Health Service Research Career Development Award. While there he showed the dynamic movement of virus molecules on the surface of infected cells, and with a pediatrician colleague, Dr. David Carver, developed a new test to detect rubella virus. During this time in New York, he was director for nine years of the post-doctoral course on quantitative animal virology and cell culture that was taught in the summer at Cold Spring Harbor Laboratory (NY). In 1969 Marcus returned to the University of Connecticut, where he was appointed head of the Microbiology Section. He spent the remainder of his career at the University of Connecticut, where he administered the first Program Project on campus supported by the National Institute of Health, chaired the first Biosafety Committee, created a Virus and Interferon Research Laboratory recognized internationally for its innovative studies, published over 130 scientific papers, and was awarded five U.S. patents. As an early director of the Biotechnology Center, he helped attract companies with a focus on biotechnology to Connecticut. Then, for twelve years as director of the Biotechnology/ Services Center, he expanded the acquisition of state-of-the art instruments, which drew scientists to the facility. He continued to advance biotechnology in Connecticut as a charter member of the Connecticut Academy of Science and Engineering and was pleased to know that the Research Park planned for Storrs, Connectucut, will be realized. In 1987 he received the University of Connecticut Alumni Association Award for Excellence in Research, and in 2003 was recognized as a board of trustees distinguished professor. His annual course in virology, taught for thirty-six years, was both sought after, and evaded, the former by students looking to be challenged. These students were a source of great pride. Decades later he continued to receive accolades from students expressing appreciation for the opportunity to experience that challenge. Marcus was a member and active participant in a number of professional scientific societies, including the American Society for Virology and the International Society for Interferon and Cytokine Research, which in 2005 named him as an honorary member. Serving eighteen years as editor-in-chief of the Journal