Final answer:
Donald Meichenbaum has contributed significantly to the development of cognitive-behavioral therapy, which is a blend of cognitive and behavioral strategies used in the treatment of psychological disorders.
Step-by-step explanation:
Donald Meichenbaum is a prominent contributor to the development of cognitive-behavioral therapy (CBT). He is particularly known for his work on cognitive-behavioral techniques and for coining the term and developing the concept of cognitive behavior modification. Meichenbaum's contributions to psychology are significant, particularly in the area of CBT, which combines both cognitive and behavioral strategies to treat various psychological disorders. His work is a part of the larger field of cognitive psychology which focuses on the study of human thinking and also contributes to understanding the treatment of psychological disorders.