integrating computation yet was a precursor of what is today known as computerized tomography; and achieved its combination with electroencephalogram, termed tomoencephalography. Carrillo also produced a body of research into brain herniations protruding into blood cisterns (cisternal herniations) and the syndromes occurring after a brain contusion; he discovered what became known as "Carrillo's disease," or acute papillitis; described in detail the cerebral scleroses, during whose research he performed many cerebral transplants (brain grafts) between living rabbits; and histologically reclassified the cerebral tumors and the inflammations of the innermost brain envelope (arachnoid mater) known as arachnoiditis. He also proposed a widely used, pre-DSM classification of mental illnesses. Against considerable opposition from conservative colleagues, in 1942 and at the age of 36 Carrillo became the Chair of Neurosurgery at the University of Buenos Aires School of Medicine. Among the influential Argentine physicians he trained were Germán Dickmann, Raúl Matera, D. E. Nijensohn, Raúl Carrea, Fernando Knesevich, Lorenzo Amezúa, Jorge Cohen, Jacobo and Leon Zimman, Rogelio Driollet Laspiur, Juan C. Christensen, and Alberto D. Kaplan. Later career During those years Carrillo exclusively dedicated himself to research and teaching, until becoming Head (1939) of the Neurology and Neurosurgery Service in the Central Military Hospital. This post afforded him a deep acquaintance with the real situation of public health in Argentina, which like his own province reflected a state of neglect in much of the countryside. He became well informed on the clinical files of all young men examined for enrollment into military service, and became aware of the high prevalence of poverty-linked diseases (especially in recruits from the poorest provinces). He carried out statistical studies showing that the country only had 45% of the required hospital beds, and that these were moreover unevenly distributed. Carrillo was at the height of his medical career when he became acquainted with the Colonel Juan Domingo Perón, a patient at the Central Military Hospital with whom Carrillo shared long talks. Colonel Perón was the increasingly influential Labor Minister in the nationalist military regime that took power after the 1943 Argentine coup d'état, and during these talks persuaded Carrillo to help plan national health policies. Carrillo, at age 39, briefly served as Dean of the School of Medicine, acting as a go-between in a fierce, highly politized, Left-Right university conflict, which ultimately forced him to quit his faculty post. Argentina's first health minister Juan Perón was elected to the