Bestselling author Stephan Schiffman founded D.E.I. Management Group in 1979 and has since led his company to become one of the nation's fastest growing sales training companies. A leader in motivational and sales training, he is a certified management consultant who has trained and consulted with a wide range of international corporations, including IBM, AT&T, Motorola, Sprint, and CIGNA. Schiffman has written over 50 books, which have sold well over six million copies internationally and have guided generations of salespeople through their career challenges. His articles are published frequently in publications such as The Wall Street Journal, The New York Times, Sales and Marketing Management, Personal Selling Power, Corporate Travel Magazine, and INC. magazine. Mr. Schiffman divides his time between managing D.E.I., selling, training, consulting, and product development. He continues to serve as a frequent guest on national radio and television shows, including CNBC’s Smart Money, Minding Your Business, Steals and Deals, and Money Talk.

Stephan Schiffman, former president of D.E.I. Franchise Systems, Inc., one of the largest sales training companies in the United States, is the author of a number of bestselling books. These include Cold Calling Techniques (That Really Work!), Closing Techniques (That Really Work!), The 25 Most Common Sales Mistakes, The 25 Habits of Highly Successful Salespeople, and Selling When No One Is Buying. His articles have appeared in The Wall Street Journal, The New York Times, and INC. magazine. He has appeared as a guest on CNBC, CBN, CNN, and Fox News. He lives in New York City.