Frank Daniels writes the Rock by Numbers, Market Watch, and Ask the Expert columns for Goldmine. He is the co-author of Beatles for Sale on Parlophone with Bruce Spizer sold in the Goldmine store and the Beatles and Beach Boys Price Guide series (with Perry Cox and Mark Galloway). By day, he teaches mathematics and statistics at a community college, and has taught "History of Rock Music." He claims to be working on a book about Elvis. Frank amuses himself by creating online labelorgraphies and discographies. See https://www.friktech.com/btls/btls2.htm for more zany details.