David P. Campbell (1934-2021) was an American psychologist. He earned his BS and MS at Iowa State University and his PhD in Psychology at the University of Minnesota, where he went on to become Professor of Psychology. He co-authored the Strong-Campbell Interest Inventory and created the Campbell Skills and Interest Survey, both widely used in career counseling and management. Dr. Campbell was the recipient of numerous awards and honors and was the author of many books. He was also known for having the largest private postcard collection in the world, having accumulated nearly 300,000 postcards on his extensive travels.