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Harry Stack Sullivan

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Harry Stack Sullivan was an American doctor. He was a psychiatrist. This is a doctor who helps people with their minds. He lived in New York. He grew up in a town called Norwich.

Sullivan had big ideas about how we act. He believed that people cannot be alone. He thought our personalities come from our relationships. This means who we are depends on the people around us. He felt that being lonely is very painful.

He studied how people talk and act with others. He called this interpersonal relations. He also looked at the "Self system." This is the way we act to feel safe. He thought people use certain habits to avoid feeling scared.

Sullivan helped many people. He worked with patients who had severe mental illness. He also helped make rules for the military. He wanted to be fair to everyone. He believed that being gay should not be a reason to be treated poorly. He died in Paris in 1949. His ideas still help doctors today.

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