Specializing in Bust and Liberty Seated coinage Mr. Greer has been recognized for his expertise in U.S. coinage for over twenty three years. Author of "The Complete Guide to Liberty Seated Dimes", and contributing author to The Complete Guide to Liberty Seated Half-Dimes, The Complete Guide to Liberty Seated Quarters, and The Complete Guide to Liberty Seated Half-Dollars. 

Contributor to multiple publications specializing in all Liberty Seated denominations, and is a regular contributor to the Numismatic News Coin Market price guide. 

Mr. Greer has also been an instructor at the American Numismatic Association Summer Seminar teaching courses in the field of U.S. Liberty Seated coin varieties.