Today, we are honored to bring you an interview with Jack Guttentag, the self-styled Mortgage Professor. Dr. Guttentag is a Professor of Finance Emeritus at the Wharton School of the University of Pennsylvania, and founder of GHR Systems, Inc., a mortgage technology company. He is also one of the most prolific and respected mortgage columnists, and his advice can be found on his personal website and in the Washington Post. Below, Dr. Guttentag shares his thoughts on locking in an interest rate, the mortgage interest tax deduction, and a handful of other topics.

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