As architect, he is supposed to have remodeled the church of San Matteo in Genoa and to have designed the imperial palace at Campetto.
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Born in Gandino near Bergamo, he is ordinarily termed Il Bergamasco to distinguish him from the other painter (of miniatures) with the identical name from school of Genoa.
Son of the first marriage of Giovanni Battista Castello ("Il Bergamasco"), Granello came to Spain while still a child, around 1567, accompanying his stepfather, and called by Álvaro de Bazán, 1st Marquis of Santa Cruz to work on his palace in Viso del Marqués.
Don Giovanni | Giovanni Pierluigi da Palestrina | Giovanni Bellini | Giovanni Riggi | Giovanni Boccaccio | Giovanni Battista Pergolesi | Giovanni Battista Tiepolo | Giovanni Battista Guarini | Giovanni | Giovanni Trapattoni | Giovanni "John the Eagle" Riggi | Giovanni Gabrieli | Città di Castello | Leon Battista Alberti | Giovanni Falcone | Villa San Giovanni | San Giovanni in Persiceto | Giovanni Verga | Giovanni van Bronckhorst | Giovanni Tamagno | Giovanni Pacini | Giovanni Battista Pescetti | Giovanni Papini | Giovanni Hidalgo | Giovanni Domenico Cassini | Giovanni de' Medici | Giovanni Bottesini | Giovanni Battista Riccioli | Giovanni Zenatello | Giovanni Visconti |
He returned to Genoa in 1585 after the death of his father, where he took up teaching, mentoring among others Giovanni Andrea Ansaldo, Simone Barabino, Giulio Benso, and Giovanni Battista Castello.