Frank J. Grizel

About the Author

Frank J. Grizel is a distinguished authority on American antique glassware, with decades of experience as a collector, appraiser, and historian dedicated to preserving the legacy of early 20th-century industrial art. His passion for slag glass, a uniquely American innovation blending molten glass with metal oxides to create striking marbled effects, has driven his meticulous research into its production techniques, makers, and market evolution. Through his seminal work, American Slag Glass: Identification and Values, Grizel provides collectors and enthusiasts with an indispensable guide to authenticating pieces from iconic manufacturers like the Westmoreland Glass Company and Imperial Glass Corporation, complete with detailed identification tips, historical context, and current valuation insights. A frequent lecturer at antiques symposiums and contributor to specialized journals, Grizel continues to illuminate the beauty and craftsmanship of this overlooked American treasure.