Maramorosch traveled extensively to lecture and teach as visiting professor in Argentina, Armenia, China, Egypt, Germany, India, Israel, Japan, Kenya, Mexico, Netherlands, Nigeria, Poland, Russia, Sri Lanka, Uzbekistan and Yugoslavia. His major research interests include comparative virology, invertebrate cell culture, parasitology, emerging diseases caused by viroids, viruses, phytoplasmas and spiroplasmas, biotechnology, and international scientific cooperation. Maramorosch continued, through 2015, to be active in the field by conducting research, publishing, presenting his findings at professional meetings, and organizing international conferences to promote new advances in the field. In his career of over 60 years, Maramorosch published as author or co-author more than 800 scientific papers and 100 books. A partial list follows:     40-48. Methods in Virology, 8 vols. 1967–1984.     49-56. Advances in Cell Culture, 7 vols., 1981-1989.     57-215. Advances in Virus Research, 56 vols. 1973-2015.