Vincent Matthew Sarich (December 13, 1934October 27, 2012) was an American anthropologist and biochemist. He was Professor Emeritus in anthropology at University of California, Berkeley. Sarich and his PhD advisor, Allan Wilson, used molecular data to estimate that humans and chimpanzees have a common ancestor just four to five million years ago. Their paper on their finding was published in 1967. At the time, scientists considered the common ancestor to live ten to 30 million years ago, and their revised estimate has become well accepted. Sarich generated controversy with his support for analyzing human behavior and populations in evolutionary terms. Early life and education Born in Chicago, he received a bachelor of science in chemistry from Illinois Institute of Technology and his masters and doctorate in anthropology from University of California, Berkeley, where he was supervised by Sherwood Washburn. He was a member of the Department of Anthropology at Stanford from 1967 to 1981, and taught at UC Berkeley from 1966 through 1994. As a doctoral student, and along with his PhD supervisor Allan Wilson, Sarich measured the strength of immunological cross-reactions of blood serum albumin between pairs of creatures, including humans and African apes (chimpanzees and gorillas). The strength of the reaction could be expressed numerically as an Immunological Distance, which was in turn proportional to the number of amino acid differences between homologous proteins in different species. Sarich and Wilson showed that the pattern of differences between modern species could only be explained if the molecular change along different lineages had in fact accumulated approximately equally (i.e., where a type of 'molecular clock'). This method they called the relative rate test, and it showed that one could empirically test whether the molecular change was constant simply by looking at the pattern of differences between modern forms of the molecule. By constructing a calibration curve of the I.D. of species' pairs with best-attested divergence times in the fossil record, the data could be used as a molecular clock to estimate the times of divergence of pairs with poorer or unknown fossil records. Career In their 1967 paper Immunological time scale for hominid evolution in Science, Sarich and Wilson estimated the divergence time of humans and apes as four to five million years ago, at a time when standard interpretations of the fossil record gave this divergence as at least 10 to as much as 30 million years. Their logic