David Mattson, President and CEO of Sandler Training and 6-time Author, talks about his Wall Street Journal and BusinessWeek best-selling book, The Sandler Rules: 49 Timeless Selling Principles and How to Apply Them.
David Mattson, President and CEO of Sandler Training and 6-time Author, talks about his Wall Street Journal and BusinessWeek best-selling book, The Sandler Rules: 49 Timeless Selling Principles and How to Apply Them.