[1] A student of Giulio Cesare Pupilli and Cesare Musatti, he was one of the foremost pioneers in the rebirth of Italian psychology after World War II, as well as the founder of the Bologna School of Gestalt Psychology[2] and the guiding force behind it for 40 years.
One of his main interests was perception under the Gestalt theoretical point of view and its impact on mental health.
Among Canestrari's students were several of Italy's most influential Gestalt psychologists of the following decades, e.g. Anna Arfelli Galli, Giuseppe Galli, Mario Fame, Paolo Bonaiuto, Alberto Ranzi, Pietro Tampieri, Giuliana Giovanelli, Giancarlo Trombini, Vincenzo Faenza, Augusto Palmonari and Gabriella Bartoli.
[3] From 1979 to his death, Canestrari was a member of the Advisory Board of the international multidisciplinary journal Gestalt Theory.
In 1991 he founded the Dipartimento della Formazione of the University of the Republic of San Marino.