In 1896 Guido entered the Scuola Normale Superiore di Pisa. There he was taught by Dini and Bianchi, who quickly influenced Guido to undertake research in geometry. He presented his doctoral thesis Clifford's Parallelism in Elliptic Spaces in 1900. Most young doctoral students take a few years to make themselves well know in their area. However, Guido was lucky for his teacher Bianchi was about to publish an important work on differential geometry. Bianchi discussed the results of Guido's thesis in his treatise, which appeared in 1902.
Guido remained at Pisa to qualify as a university teacher. Most mathematicians at this stage in their careers extend the work they have begun in their doctoral thesis, but not Guido. He attacked a completely new topic to the one he had studied for his doctoral thesis studying the theory of harmonic functions in spaces of constant curvature.
Guido's interests were exceptionally wide moving from his early work on differential geometry towards analysis. In this area he work on differential equations, analytic functions, and functions of several complex variables. He taught courses on these analysis topics at both the Politecnico and the University in Turin. During World War I, Guido studied the accuracy of artillery. These investigations led him on to work on acoustics and electricity.
Guido was forced to retire from his chair in Turin. He had no wish to leave Italy but he had two sons who were engineers and, always a man who was devoted to his family, Guido decided that his sons had no future in a country whose official