Answer:
Stanley hall
Explanation:
Stanley hall was a psychologist who was the first person to earn a Ph.D. degree in psychology and become the first president of the American psychological association. He has influenced on developmental psychology. He worked as a teacher. He was the first person who influenced another psychologist.
He was known for his best work such as become the first president of APA
Found first psychology lab at Hopkins University
First American who earns a Ph.D.