Dr. McCullough specializes in 19th Century American Literature, Mark Twain, American Humor, and the Bible as Literature. Since receiving the Ph.D. in 1969, Dr. McCullough has produced 8 books, 30 articles, and delivered numerous papers at professional meetings. A specialist in Mark Twain and Hamlin Garland, he also writes widely on American literature and American humor. He was a Fulbright Lecturer in American Literature twice: Helsinki University (1980) and University of Athens (1985). In 1993, he received the UNLV Alumni Distinguished Faculty of the Year Award; he was named "Outstanding Faculty Member" by the University of Nevada Board of Regents in 1995; in 1996 he received the Barrick Distinguished Scholar Award. In 1998 Dr. McCullough was named Distinguished Professor of English.