Janet Suzanne Sinsheimer (August 28, 1957 – March 14, 2023)^[1][2] was an American expert in statistical genetics who worked as a professor of human genetics, biomathematics and biostatistics in the Fielding School of Public Health at the University of California, Los Angeles.^[3] Topics in her research included genome-wide association studies, epigenetics, and Bayesian methods for phylogenetics.

Sinsheimer was born in Montclair, New Jersey in 1957.^[2]

Sinsheimer graduated from Brown University in 1979, majoring in chemistry. She earned a master's degree in biochemistry in 1985 from Brandeis University, a second master's degree in biomathematics in 1988 from the University of California, Los Angeles (UCLA), and a Ph.D. in biomathematics in 1994 from UCLA.^[3] Her dissertation, Extensions to Evolutionary Parsimony, concerned phylogeny (the inference of evolutionary trees), and was jointly supervised by evolutionary biologist James A. Lake and biostatistician Roderick J. A. Little.^[4]

Sinsheimer became a Fellow of the American Statistical Association in 2013.^[5] The Linnean Society of London elected her as a fellow in 2014.^[6] In 2017 the Boston University Department of Biostatistics gave her the L. Adrienne Cupples Award for Excellence in Teaching, Research, and Service in Biostatistics.^[7]