In 1946 Bernhard hired Samuel Eisenstadt, a brilliant and modest young man fresh out of the Army, as a proofreader. Eisenstadt was a graduate of Baruch College who majored in statistics. In 1965 Eisenstadt convinced Bernhard to use a statistical method called ordinary least squares (OLS) regression analysis to replace Bernhard's visual method of fitting cash flow to a price chart. Using scores of Monroe mechanical calculators and a handful of data operators, Bernhard and Eisenstadt produced a stock picking system so successful that it caught the attention of the famed academician Fischer Black of the University of Chicago. Black validated the system's results when he published his famous article in the Financial Analysts Journal, "Yes, Virginia, There Is Hope: Tests of the Value Line Ranking System" in 1973. The system came to be known as the "Value Line Ranking System for Timeliness". With Eisenstadt on board, Bernhard continued to expand the business, adding the other publications and mutual funds along the way. In May 1983, Value Line sold stock for the public for the first time (), though the Bernhard family retained 80% control.