David S Rosenblatt, Canadian geneticist Peyton Rous (1879–1970), US tumor virologist and tissue culture expert, Nobel Prize Janet Rowley (1925–2013), US cancer cytogeneticist who found Ph chromosome due to translocation Peter T. Rowley (1929–2006), US internist and geneticist, genetics of cancer and leukemia Frank Ruddle (1929–2013), US biologist, somatic cell genetics, human gene mapping, paved way for transgenic mice Ernst Rüdin (1874–1952), Swiss psychiatrist, geneticist and eugenicist who promoted racial hygiene Elizabeth S. Russell (1913–2001), US mammalian geneticist, pioneering work on pigmentation, blood-forming cells, and germ cells Liane B. Russell (1923–2019), Austrian-born US mouse geneticist and radiation biologist William L. Russell (1910–2003), UK-US mouse geneticist, pioneered study of mutagenesis in mice S Leo Sachs (1924–2013), German-Israeli molecular cancer biologist, colony-stimulating factors, interleukins Ruth Sager (1918–1997), US geneticist, pioneer of cytoplasmic genetics, tumor suppressor genes Joseph Sambrook (1939–2019), British viral geneticist Avery A. Sandberg (1921–2016), US internist, discovered XYY in 1961, expert on chromosomes in cancer Lodewijk A. Sandkuijl (1953–2002), Dutch expert on genetic epidemiology and statistical genetics Larry Sandler (1929–1987), US Drosophila geneticist, chromosome mechanics, devoted teacher John C. Sanford (born 1950), US horticultural geneticist and intelligent design advocate Fred Sanger (1918–2013), UK biochemist, two Nobel Prizes, sequence of insulin, DNA sequencing method Ruth Sanger (1918–2001), Australian expert on blood groups, along with husband Robert Race Karl Sax (1892–1973), US botanist and cytogeneticist, effects of radiation on chromosomes Paul Schedl (born 1947), US molecular biologist, genetic regulation of developmental pathways in fruit fly Albert Schinzel (born 1944), Austrian human geneticist, clinical genetics, karyotype-phenotype correlations Werner Schmid (1930–2002), Swiss pioneer in human cytogenetics, described cat eye syndrome Gertrud Schüpbach (born 1950), Swiss-US biologist, molecular and genetic mechanisms in oogenesis Charles Scriver (born 1930), Canadian pediatrician, biochemical geneticist, newborn metabolic screening Ernie Sears (1910–1991), Wheat Geneticist who pioneered methods of transferring desirable genes from wild relatives to cultivated wheat in order to increase wheat's resistance to various insects and diseases Jay Seegmiller (1920–2006), US human biochemical geneticist, found cause of Lesch–Nyhan syndrome Fred Sherman (1932–2013), US geneticist, one of the "fathers" and mentors of modern yeast genetics Pak Sham, geneticist known for his work in psychiatric genomics Larry Shapiro, US pediatric geneticist, lysosomal storage disorders, X chromosome inactivation Lucy Shapiro (born 1940), US molecular geneticist, gene expression during the cell cycle, bacterium Caulobacter Phillip Sharp (born 1944), US geneticist and molecular biologist, Nobel Prize for co-discovery of gene splicing Philip Sheppard (1921–1976),