Who is credited with founding child development as an academic discipline and used questionnaires to study the ""contents of children's minds?""

The person wh was credited with founding child development is Granville Stanley Hall.

Explanation:

G. Stanley Hall was a psychologist who gave early incentive and started the path on the development of psychology in the USA. He was credited with founding child development as an academic discipline as well as educational psychology. He also used questionnaires as a method to study the children and the "contents of children's minds." The discipline of child development is defined to be the study of children's psychological processes and, more importantly, how these processes differ from the psychological progressions of adults. It also looks at how children develop from birth to adolescence. And although G. Stanley Hall has been credited with founding the discipline, the discipline was started back in 1840, when Charles Darwin started keeping a record of the growth and development of one of his own children.