Berwind P. Kaufmann was an American biologist. After starting off as a botanist looking at plant chromosomes, he made pioneering contributions to three principal fields of basic cytogenetics:the formation of chromosomal rearrangements by exposure to ionizing radiation; the identification of specialized regions of the somatic chromosomes of the fruit fly Drosophila; and the determination of the biochemical composition of both plant and animal chromosomes using purified enzymes.