Sandler Success Principles: 11 Insights That Will Change the Way You Think and Sell

David Mattson is CEO and a partner at Sandler Systems, Inc., an international training and consulting organization headquartered in the United States. In 1986, Mattson met the founder of Sandler Training, David H. Sandler, and fell in love with his philosophy, methods and materials. In 1988, he went to work for Mr. Sandler, and was eventually chosen to lead the company. Mattson continues to be a trainer and business consultant for management, sales, interpersonal communication, corporate team building and strategic planning worldwide.

David is also the author of The Sandler Rules: 49 Timeless Selling Principles and How to Apply Them, and co-author of Five Minutes with VITO: Making the Most of Your Selling Time with the Very Important Top Officer.


Bruce Seidman is the President and a partner at Sandler Systems, Inc. Bruce has been with Sandler Systems since 1983.  He carries on the legacy his father, David Sandler, began in 1967. Bruce works closely with Sandler trainers to help them grow and continually stretch and improve, using technology to share best practices across the entire global team.  Sandler Training&;s core strength lies in the growth and development of its 500-plus trainers, who live the Sandler Rules and Sandler Insights each day.