In the 1992 book Mastery, George Leonard reflects on how we as individuals and professionals learn and gain competency in various skills. Some of us dabble in learning, some of us seek the “hacks” that will get us the biggest bang for our buck or time investment. Still other engage in true practice toward mastery or what Leonard describes as “the path upon which you travel… anything you practice on a regular basis as an integral part of your life- not in order to gain something else, but for its own sake.” This definition stands in stark contrast to much of formal education paths many of us have traveled, yet, we know that a certain point in our individual and professional development it is crucial to cultivate a regular practice of curiosity and even disruption to combat over-whelming demand in our culture for a quick-fix at the lowest common denominator. Are you a dabbler? or maybe a hacker? or are you on a path to mastery as leader or professional? If so, this book will likely be a source of insight and inspiration for you for years to come.