Studied privately with Galileo (1564-1642) in Padua from 1597 to c. 1600. Treasurer of Palmanova (Friuli) (1605-1607) and Venetian consul in Syria (1608-1611). Despite these long absences, he remained closely linked to Galileo. On his return to Venice, in 1611, he resumed his correspondence with the Pisan scientist - now back in Tuscany - which continued until Sagredo's death. An active amateur scientist, Sagredo conducted experiments on magnetism, optics, mechanics, and thermometry. As a token of their sincere friendship, Galileo gave his name to one of the protagonists of his mature work, the Dialogues.