David's guest this week is Jack Derby. Jack is a long-time professor of entrepreneurship and marketing at Tufts University and M.I.T. He’s been at the helm of several companies and startups, and in 1990, he founded Derby Management, a consulting firm specializing in strategic business planning ang revenue growth. In part one, Jack shares how his "Science of Sales" can help accelerate growth and maximize performance and the importance of inviting guest lecturers and certified coaches to help his students in the classroom.