This book combines two functions, as a technical handbook for training epigraphists to recognize an individual mason's hands, and a social study of a skilled artisan in Hellenistic Athens (referred to as "B"), a native of Salamis who worked in Athens and at Delphi. The methodology developed by the author to isolate 28 out of hundreds of inscriptions as the work of "B" represents a major step forward in the assigning of fragments to individual masons, previously a very impressionistic exercise.