“…Professor Klein was an overenergetic researcher in clinical psychopharmacology and psychopathology, and published in such varied areas of psychiatry as panic disorder, depression, mood disorders, childhood anxiety, schizophrenia, and in related areas of methodology and ethics. Among publications in prestigious journals such as Science , JAMA , The Lancet , The American Journal of Psychiatry and JAMA Psychiatry , Professor Klein published an update article2 and two editorials3,4 in the Brazilian Journal of Psychiatry.…”