Alexander Sirotkin, PhD., DrSc. is a known specialist in biology of reproduction and leader in studies of some ovarian signaling substances and factors regulating female reproduction. He received his PhD degree at the University of Leningrad (USSR), PhD degree in the Institute of Evolutionary Physiology and Biochemistry (Leningrad, USSR) and DrSc degree in the Research Institute of Animal Production (Nitra, Slovakia). He worked as Research Scientist, Senior Research Scientist, Head of the Laboratory and Project Leader in the Research Institute of Animal Breeding and Genetics (Leningrad-Pushkin, USSR), International Laboratory for Biotechnology (Nitra, Czechoslovakia), Research Institute of Animal Production/Animal Production Research Centre (Nitra, Slovakia) and Constantine the Philosopher University (Nitra, Slovakia) which is his current affiliation. His teaching activities included lectures at more than 10 universities and research centers, as well as the supervision of more than 60 undergraduate and PhD student works. He has more than 650 publications, mainly in international biomedical journals and several books including recent monograph “Regulators of Ovarian Functions? (Nova Science Pub Inc, 2014). He has been nominated for?more than 10national and international awards for his work in the areas of biology and the endocrinology of reproduction.