Alexander Tzetlin, Prof., Dr. in Biological Sciences, Faculty of Biology, M.V. Lomonosov Moscow State University, Russia. Director of Nikolai Pertsov White Sea Biological Station of MSU. More than 100 peer-reviewed scientific articles, member of the editorial boards of Journal of Morphology and Zoologicheskiy Zhurnal, Frontiers in Marine Science, reviewer in several peer-reviewed journals, Member of: the Executive Board of MARS (European Network of Marine Research Institutes and Stations), Member of American Microscopical Society. He has supervised 9 PhD theses and 18 Master theses. Lecturer in areas of Invertebrate Zoology and Marine biology. Tzetlins research focuses on taxonomy, anatomy and ultrastructure of marine annelids, functional morphology of annelids and mollusks, ecology of Arctic and Subarctic benthic communities.