Dr Jan Tesarik obtained his MD degree in 1979 and his PhD in 1982 from the University of Prague, Czech Republic. He realized the world’s first successful Gamete Intra-Fallopian Transfer (GIFT), in 1982 in the Czech Republic, and played a major role in the world’s first childbirths after round spermatid injection (ROSI) into oocyte cytoplasm in 1989. In 1998, he accomplished the world’s first childbirth after oocyte fertilization with spermatids obtained by in vitro spermatogenesis. He developed an original technique for nuclear transfer in mature human oocytes, and achieved the first fertilizable human “artificial oocytes” reconstructed from somatic cell nuclei and donor ooplasts. He is the author and co-author of more than 400 scientific publications, and is Director of the Molecular Assisted Reproduction and Genetics Clinic in Granada, Spain.