স্টিফেন শিফম্যান

Stephan Schiffman(New York, NY) has trained more than half a million salespeople at wide range of corporations including IBM, AT&T, Motorola, Sprint, and Cigna. A popular speaker, he is the author of numerous bestselling books with eight million in print, including Cold Calling Techniques (That Really Work!) and The 25 Habits of Highly Successful Salespeople.