Rate My Professor Jeffrey Hall

Jeffrey Hall is a distinguished biologist whose groundbreaking work in genetics and chronobiology has had a lasting impact on the field. He received his bachelor’s degree from Amherst College and completed his PhD in genetics at the University of Washington in 1971 under the supervision of Laurence Sandler in the Department of Genetics. After his doctorate, Hall pursued postdoctoral research at the California Institute of Technology with Seymour Benzer, focusing on neurochemical-genetic projects and genetic mosaics in Drosophila. In 1974, he joined the faculty at Brandeis University, advancing to full professor of biology and eventually retiring as professor emeritus. He also served as an adjunct professor at the University of Maine from 2004 to 2012.

Hall's research specializations center on the molecular neurogenetics of behavior and circadian rhythms in the fruit fly Drosophila melanogaster. His laboratory investigated the genetic basis of courtship behavior, identifying mutants like fruitless, cacophony, and dissonance, and exploring serotonin regulation and courtship song production. In a landmark collaboration with Michael Rosbash, Hall contributed to the cloning of the period (per) gene, the first identified clock gene, demonstrating that its protein product oscillates daily, accumulating at night and degrading during the day. This work uncovered the transcriptional-translational feedback loop involving genes such as timeless (tim), Clock (Clk), cycle (cyc), cryptochrome (cry), and pigment-dispersing factor (pdf), defining the core mechanism of the circadian clock. Key publications include Hall (2003) Genetics and molecular biology of rhythms in Drosophila and other insects in Advances in Genetics; Manoli et al. (2005) Male-specific fruitless specifies the neural substrates of Drosophila courtship behaviour in Nature; and papers on clock genes including Park et al. (2000) Differential regulation of circadian pacemaker output by separate clock genes in Drosophila in PNAS and Emery et al. (2000) A unique circadian-rhythm photoreceptor in Nature.

For these discoveries elucidating the molecular mechanisms controlling the circadian rhythm, Hall shared the 2017 Nobel Prize in Physiology or Medicine with Michael Rosbash and Michael W. Young. His contributions have profoundly shaped understanding of biological clocks, behavioral genetics, and neurobiology.