Galles was born in Tashkent, Uzbekistan, lived in Poland and Israel, before coming to the US. He studied in Rome, Italy, in 1966-67. He received a BFA from the Tyler School of Fine Arts of Temple University, Philadelphia, PA, in 1968, and an MFA from the University of Wisconsin, Madison, in 1971. He has taught at the University of Wisconsin, Southern Methodist University, School of Visual Arts, University of California at San Diego and Fairleigh Dickinson University. Currently Galles is Professor of Art and Director of the Creative Arts Program, at Soka University of America, Aliso Viejo, CA. Galles is known for his “HEARTLAND” series of Reflected-Light Paintings. He is also known for his widely exhibited suite of large format charcoal drawings, "Fourteen Stations/Hey Yud Dalet," based on World War II aerial reconnaissance photographs from Luftwaffe and Allied sources. The suite also includes Poem/Drawings by Galles of Gematria poems written by poet Jerome Rothenberg as a collaborative endeavor. At this time the suite is on exhibition at the Northern Arizona University Museum in Flagstaff. Galles is currently working on “Drawing With Ashes,” a book based on 10 years of journal entries during the creation of the "Fourteen Stations/Hey Yud Dalet" suite.
Galles’ works have been widely exhibited in galleries and museums, including multiple solo shows at the O.K. Harris Gallery, NYC, and the Zolla/Lieberman Gallery, Chicago. Galles’ works are in public and private collections in the US and abroad.