Veteran trader reminds investors of the market crashes through history
The Wall Street veteran looks back at some of the market's worst days.

Shortly before midnight on Oct. 19, 1987, Stephen Guilfoyle finally called his fiancée.
The Wall Street veteran had been working all day on that infamous Black Monday when the Dow Jones Industrial Average — still the primary measure for U.S. stock market performance at the time — lost 22.6% in a single trading session.