In this article, I recount the many ways in which Harold Guetzkow influenced my career. From the beginning of my graduate studies at Northwestern University in the 1960s into the next century, Harold's guidance has been indispensable. His idea of bridging islands of theory has provided many of us with a broad, integrated vision of social science. His workman-like approach to scholarship has provided us with the tools needed to contribute to the field. As a broad theorist, Harold inspired us to devote a lifetime in pursuit of knowledge. As a mentor, he imparted the essential skills of writing for publication, presenting at professional meetings, teaching and advising, and contributing to the profession. Above all, his values of interdisciplinary and responsible scholarship have been a hallmark of my own research and project leadership. My work on simulation reflects these values as well, with regard to research platforms and classroom learning. Indeed, a recent article in this journal owes much to Harold's influence (Druckman & Ebner, 2008). (Contains 2 notes.)