David Keller, CMT, is president and chief strategist at Sierra Alpha Research LLC, where he helps active investors make better decisions using behavioral finance and technical analysis. He is a CNBC contributor, and he recaps market activity and interviews leading experts on his “Market Misbehavior” YouTube channel. Mr. Keller is a past president of the CMT Association, a global nonprofit organization of technical analysts, and was formerly a managing director of research at Fidelity Investments and chief market strategist at StockCharts.