Donald Mitchell is a coauthor of Witnessing Made Easy, The 2,000 Percent Solution, The Portable 2,000 Percent Solution, The 2,000 Percent Solution Workbook, The 2,000 Percent Squared Solution, The Irresistible Growth Enterprise, and The Ultimate Competitive Advantage. He is the author of Adventures of an Optimist. He is the founder and chairman of Mitchell and Company, a strategy and finance firm in Weston, Massachusetts.