his fame is principally associated with his work at the certosa di pavia complex, composed of the church and convent of the carthusians. it is unlikely he designed, in 1473, the celebrated facade of the certosa itself. he worked there for eight years starting in 1486, in collaboration with his brother bernardino bergognone, when he furnished the designs of the figures of the virgin, saints and apostles for the choir-stalls, executed in tarsia or inlaid wood work by bartolomeo pola, till 1494, when he returned to milan. only one known picture, an altar-piece at the basilica of sant'eustorgio, can with probability be assigned to a period of his career earlier than 1486.