His Italian nationalism prevented him working in medicine in Trieste and so he instead began his psychiatric training in Reggio Emilia under the guidance of the Bolognese neurologist and psychiatrist Augusto Tamburini, whose school united organisational and scientific skills.
Whilst in Florence he also became one of the first in Europe to support Santiago Ramón y Cajal's neuron theory, destined to play a fundamental role in the development of neuroscience.,[1] and became superintendent of the San Salvi asylum.
In 1896 Tanzi, Tamburini and Enrico Morselli founded the Rivista di Patologia Nervosa e Mentale (RPNM), one of the first Italian reviews on neuropsychiatry.
Tanzi's own best-known works include a co-study with Riva on paranoia (1884), whilst he co-published the two-volume Trattato delle malattie mentali (Treatise on Mental Maladies) with his former student Ernesto Lugaro in 1904, with the latter remaining a central text for Italian psychiatry until the late 1920s and a long-term influence on psychopathology and psychiatric clinics.
[4] In 1929 Tanzi, Charles Scott Sherrington and Ivan Pavlov were made honorary members of the British Royal College of Psychiatry.