Dan Keegan is the founder of Optionthinker.com, a Web site for options traders. He is also an accredited charter person (ACP) for modricka.com and works with money managers to develop options overlay strategies for their clients' portfolios. Previously, Mr. Keegan was an options instructor and head options mentor for The Chicago School of Trading. He started out in the options business in 1978 and spent five years as a runner, phone clerk, and floor broker for A.G. Becker on the floor of the Chicago Board Options Exchange (CBOE). Mr. Keegan has also been a guest lecturer on the basics of options and advanced options trading, and is a frequent contributor to Futures and ModernTrader magazine and the Option News Network. He earned a BS in economics from Marquette University College of Business Administration.