University of Buenos Aires. Colegio Nacional de Buenos Aires.
Ingenieros was philosophically influenced by Herbert Spencer and Auguste Comte, and wrote a very important philosophical and social work, "El hombre mediocre" (The Mediocre Manitoba), in 1913. Ingenieros founded the Buenos Aires Institute of Criminology in 1907 and the Argentine Psychological Society in 1908. He was elected President of the Argentine Medical Association in 1909.
Ingenieros married Eva Rutenberg, from Lausanne, in 1914.
Appointed Assistant Dean of the School of Philosophy and Letters of his alma mater, he played a prominent role in the landmark University reform in Argentina, in 1918. He resigned his academic posts in 1919 to join Claridad, a communist organization, and in 1922, formed Unión Latinoamerica, a political action committee focused on anti-imperialism.
He was an active Freemason since 1898. He founded a monthly, Renovación, in 1925, but died in Buenos Aires later that year.