1997-present: Professor, Department of Chemistry , University of the Pacific , Stockton, California, USA. 1992-7: Professor and Head of Organic Chemistry Department , Moscow State Academy of Fine Chemical Technology , Russia _________Since 2011 - Honorary Professor of the Moscow State Academy of Fine Chemical Technology, Russia 1974-1992: from Junior Research Scientist to Leading Research Scientist and Head of Research Group aaaaaaaaa at the Department of Chemistry, Moscow State University , Russia