Herman A. Witkin (1916-1979), Ph.D., was a learning and cognitive psychologist and was known as a pioneer of the theory of cognitive styles. He was the author of the field-dependency vs. field-independency concept and preferred diagnosis by objective means (e.g. projective tests, task-solving tests). Dr. Witkin conducted his research at SUNY Downstate Medical Center College of Medicine (Brooklyn, NY) and at Educational Testing Service (ETS) (Princeton, NJ) until his death.
To learn more about Dr. Witkin, please visit his wikipedia page.