Composer of northern, perhaps Walloon extraction, active in Italy. He had close connections with the Venetian publishers Antonio Gardane and Girolamo Scotto. He may even have been in their employ, as is suggested by the preface to a collection of Gero's madrigals and chansons a 2 (1541) which, Scotto said, were composed at his instigation. Gardane also published a collection of three-voice madrigals. [...]
Source: James Haar: Jhan Gero quoted from Grove Music Online accessed 8 October 2010, Complete article (requires subscription).