Gian Vincenzo Pinelli (1535 – 31 August 1601) was an Italian humanist, born in Naples and known as a savant and a mentor of Galileo.
When he died, in 1601, Nicolas Fabri de Peiresc was in his house and spent some of the following months studying his library and taking notes from its catalogues.
Pinelli stood out among the early bibliophile collectors who established scientific bases for the methodically assembled private library, aided by the comparatively new figure—in the European world— of the bookseller.
Cautious and withdrawn by nature, detesting travel whether by road or canal boat, wracked by the gallstones that eventually killed him, he found solace in the library he amassed over a period of fifty years (Nuovo 2003).
Pinelli's interest in the new science of optics was formative for Galileo Galilei, for whom Pinelli opened his library in the 1590s, where Galileo read the unpublished manuscripts, consisting of lecture notes and drafts of essays on optics, of Ettore Ausonio, a Venetian mathematician and physician, and of Giuseppe Moleto, professor of mathematics at Padua (Dupre).