The period from 1520 to around 1560, encompassing Garamond's career, was an extremely busy period for typeface creation. Many fonts were cut, some such as Robert Estienne's for a single printer's exclusive use, others sold or traded between them (increasingly over time). The many active engravers included Garamond himself, Granjon, Guillaume Le Bé, particularly respected for his Hebrew fonts, Pierre Haultin, Antoine Augereau (who may have been Garamond's master), Estienne's stepfather Simon de Colines and others. This period saw the creation of a pool of high-quality punches and matrices, many of which would remain used for the next two centuries.