Regarding Adolfo Mattiello, I worked on the preface material for oneof his rendering books. He is such a delight. Try his website forinfo: dumatt.com. His office number is: 201 861 4271.
He demonstrates at "Catalogue in Motion" in Tucson usually. He'samazing. Gentle, wise soul that you can learn more from in a halfhour demo than it would take you years to discover.
does anyone know if Adolfo Mattiello still teaches classes?
He does do Catalog In Motion at the February Tucson Gem Show and hemay do product demos at other trade shows. Otherwise, he has cutback from doing workshops.