Arnold Gesell (1880–1961) was a physician and psychologist who retired from the Yale Medical School faculty in 1949, just before he turned 70 years of age. In addition to teaching, he founded a clinic in 1911 that would later be renamed the Yale Child Study Center. His pioneering research made notable use of the then-new cinematographic technologies to document the developmental stages of over 10,000 children in terms of verbal, motor, social, emotional, and cognitive growth. He was the first to study and document the stages of development and thus is known as the father of child development. He was also the first school psychologist and thus is known as the father of school psychology.

In addition to caring for children and creating an extensive archive ...