Dr. Klein was junior faculty at Boston University when I completed my cardiology fellowship at BU. Mike had trained with Dr. Lown and took me under his proverbial wing in doing studies on a rapid acting digitalis analog, acetylstrophanthadin. He taught me basic research techniques and meticulous attention to detail. When I was invited to stay at Boston University as a junior faculty member, Mike helped me with writing papers (my very first paper was co-authored with Dr. Klein on cardiac arrhythmias associated with chronic lung disease) and many more to follow. Mike’s lessons in the evaluation of patients with arrhythmias and looking at all aspects of the patient, not just the arrhythmia were invaluable. He also actively encouraged my becoming involved with implantable devices and was supportive as I began to explore new areas in device therapy, at least new at Boston University, including single chamber atrial pacing, then the early days of dual chamber pacing and actively participating in investigation studies on new devices with new capabilities. Mike never joined NASPE for although electrophysiology was part of its name, when it was first founded, the focus was on device therapy. Thank you Mike for supporting my interest in arrhythmias and devices. Much of my success is due to the lessons that you have taught me and the encouragement along the way.