Which psychologist rattled the mental health community by having participants including him admitted to a psychiatric facility as pseudo patients?

Question

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David Rosenhan conducted the famous "Rosenhan experiment" in the 1970s where he and several other participants feigned symptoms of mental illness to gain admission to psychiatric hospitals. Once admitted, they acted normally and waited to be discharged, but instead were all diagnosed with various mental illnesses and stayed in the hospitals for an average of 19 days. Rosenhan's study shed light on the difficulty of accurately diagnosing mental illness and raised ethical concerns about the treatment of patients in psychiatric facilities.

Which Psychologist Rattled the Mental Health Community by Having Participants