Donald MacKinnon was a prominent Scottish philosopher and psychologist known for his work in the fields of creativity and personality. He contributed significantly to the understanding of how creative processes function and the characteristics of creative individuals. His research often explored the relationship between creativity and various psychological factors. In addition to his academic work, MacKinnon was involved in the development of assessment tools for measuring creativity. He is best known for his studies on the Torrance Tests of Creative Thinking and his influence on the field of psychology regarding creativity and innovation. His legacy continues to impact researchers and educators today.