Full time dealer after 1972. Founder of Professional Coin Grading Service (PCGS). Formed Collectors Universe in 1998. Chairman and CEO of Collectors Universe. He was terminated on September 18, 2018. He contributes the column, "An Insider’s View” to Coin World.
In 2021 he was on the Coin World list of The Most Influential People in Numismatics 1960-2020.
Source credit: Pete Smith, American Numismatic Biographies