Original sentence: Lester Grinspoon is Associate Professor Emeritus of Psychiatry at Harvard Medical School and the author of several drug-related books, including Marijuana Reconsidered, Psychedelic Drugs Reconsidered, and Marijuana: The Forbidden Medicine
Edited sentence: Lester Grinspoon is Associate Professor Emeritus of Psychiatry at Harvard Medical School and the author or co-author of several drug-related books, including Marijuana Reconsidered, Psychedelic Drugs Reconsidered, and Marijuana: The Forbidden Medicine