Krashenyuk A.I. graduated from the 1st Pavlov Medical Institute in 1971 in Leningrad, and postgraduate studies in biochemistry at the same institute in 1974 from Professor V.I. Rosengart.In 1974 he received the degree of Candidate of Medical Sciences. From 1974 to 1985 he worked as a senior researcher and head of the laboratory of biophysical methods of research at the Pasteur Institute in Leningrad. He was engaged in the development of vaccines against measles, mumps, influenza, tick-borne encephalitis. From 1985 to 1992 he headed the laboratory of live influenza vaccines and biophysical methods of research . Created the world's first purified live influenza vaccine, which was vaccinated 4.5 million people without post-vaccination complications. In 1995 he received the degree of Doctor of Medical Sciences from the Institute of Influenza of the Russian Academy of Medical Sciences (RAS). One of the creators of space biotechnology for the production of highly purified viral proteins in microgravity. In 1996 and to the present time the creator of the world's first department and Academy of Hirudotherapy. Honorary Scientist of Europe, Academician of the European Academy of Natural Sciences (Germany), Grand Doctor in Biology and Medicine (Oxford), Full Professor of Oxford.