The prime proponent for deinstitutionalization was Dorothea Lynde Dix.

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While Dorothea Lynde Dix was a pioneering advocate for the mentally ill and played a significant role in the creation of the first generation of American mental asylums, the movement for deinstitutionalization primarily gained momentum in the mid-20th century, well after Dix's time, with advances in psychiatric medications and changing attitudes towards mental health care.

The Prime Proponent for Deinstitutionalization Was Dorothea Lynde Dix