 Because of a lack of facilities in Champaign-Urbana, Cohen and his students travel to medical schools elsewhere to work with patients who have brain disorders such as amnesia, Alzheimer's disease, or schizophrenia.Cohen has collaborated extensively with Melissa C. Duff and others at the University of Iowa College of Medicine, Iowa City, as well as with researchers at Washington University, Vanderbilt, Northwestern and Rush Medical College.In 2012, Cohen was one of six Illinois professors elected to membership in the American Association for the Advancement of Science, in recognition of his “pioneering research on memory and amnesia, distinguishing brain systems and psychological characteristics that distinguish declarative and procedural memory.”