Robert "Bob" Shaw Egan (born 1945) is a botanist and lichenologist, specializing in the family Parmeliaceae.
Robert S. Egan graduated from the University of Colorado Boulder in 1967 with B.A., in 1969 with M.A., and in 1971 with Ph.D.
He became an assistant professor at Castleton State College (now called Castleton University) and then from 1975 to 1979 was a faculty member at Texas A&M University.
[1][2] Egan has collected lichens in the U.S., Canada, Mexico, Puerto Rico, Costa Rica, and Guatemala.
His recent research has focused on "floristic and taxonomic studies of the lichens of Wyoming's Snowy Range, the Big Thicket National Preserve in East Texas, and the Lichen family Parmeliaceae in Mexico."