John Castagno is a multimedia artist and sculptor. He has been an art researcher for the past forty years and also lectures on art and on art as an investment. Mr. Castagno's recent books include Abstract Artists: Signatures and Monograms, An International Directory, From 1900 (2007), American Artists II: Signatures and Monograms, From 1800 (2007), Artists' Monograms and Indiscernible Signatures II: An International Directory, From 1900 (2007), and European Artists II: Signatures and Monograms, From 1800 (2007).

...a useful reference tool...This is an important work and is recommended for art and museum libraries. The directory's uniqueness and value to art scholars make it a necessary acquisition for those academic libraries that support graduate study in art.