25 Sales Secrets of Highly Successful Salespeople is a must-listen for all salespeople. Stephan Schiffman, America''s number one corporate sales strategist and president of D.E.I. Management Group, an international sales training and consulting firm, shares with you the twenty-five traits that will distinguish you as a high-efficient salesperson. Schiffman''s pragmatic ideas range from how to be a "consultant " to your prospects, to asking for the next appointment while you''re on the first visit.