R. Brent Tully is an astronomer at the Institute for Astronomy in Honolulu, Hawaii. His specialty is the astrophysics of galaxies. He, along with J. Richard Fisher, proposed the now-famous Tully-Fisher relation in a paper, A New Method of Determining Distances to Galaxies, published in Astronomy and Astrophysics, Vol. 54, No. 3, in February, 1977.