Chancellor Block's area of scientific expertise is biological clocks. His research has focused on the neurobiology of circadian rhythms, specifically the neural mechanisms by which organisms adjust sleep and wakefulness to the day and night cycle. Most recently, he has examined the effects of aging on the biological clock.

From 1991 to 2002, he directed the National Science Foundation's Science and Technology Center in Biological Timing, which was based at the University of Virginia. The center's research led to a breakthrough in the understanding of the molecular and neural mechanisms involved in biological timing. Through the work of the center, the University of Virginia became a world leader in circadian biology research.

Chancellor Block has published more than 100 scientific papers, chapters and reviews, and has organized more than 30 scientific meetings. He has served on scientific advisory boards at the University of Pennsylvania, University of Pittsburgh, Emory University, Morehouse School of Medicine, University of Maryland and University of Alaska, Fairbanks.

He has invented a number of medical devices and holds a patent for a non-contact respiratory monitor for the prevention of Sudden Infant Death Syndrome.

Chancellor Block is a fellow of the American Association for the Advancement of Science and was a visiting fellow of the Japanese Society for the Promotion of Science.

Selected recent publications:

Nakamura, W., S. Yamazaki, N. Takasu, K. Mishima,and G.D. Block. 2005. Differential response of Period 1 expression within the suprachiasmatic nucleus. J Neurosci 25:5481-5487.

Albus, H., M.J. Vansteensel, S. Michel, G.D. Block, and J.H. Meijer. 2005. A GABAergic mechanism is necessary for coupling dissociable ventral and dorsal regional oscillators within the circadian clock. Curr Biol 15:886-893.

Lundkvist, G.B.,Y. Kwak, E. Davis, H. Tei and G.D. Block. 2005. A calcium flux is required for circadian rhythm generation in mammalian pacemaker neurons. J. Neurosci 25:7682-7686.

VanderLeest, H.T., T. Houben, S. Michel, T. Deboer, H. Albus, M.J. Vansteensel, G.D. Block and J.H. Meijer JH. 2007. Seasonal encoding by the circadian pacemaker of the SCN. Curr Biol 17:468-473.