Italian sculptor and architect, part of a family of artists, father of Guglielmo della Porta. From 1513 active in Genoa, then he worked in Cremona (sarcophagus of Sts Peter and Marcellino in San Tommaso) and from 1524 to 1528 he was architect of the cathedral of Milan. Again in Genoa in 1531, with various help he carried out a series of works (ciborium and altar in the chapel of St John the Baptist in the cathedral, two statues for the Palazzo San Giorgio, etc.). He established a style between Lombard and Michelangelesque. Based on Vasari, he is often confused with another Giovanni Giacomo della Porta, who in 1494-97 worked at the Certosa di Pavia, collaborating there on the tomb of Gian Galeazzo Visconti. //