In the first part of this Chapter there is a brief review of my personal experiences with Dorion Cairns, including how and why I came to become his Literary Executor. The Chapter then provides a focused overview of his philosophical life and central ideas, especially his life-long reflections centered on unraveling and developing appropriate language to express adequately and accurately the Husserlian conception of phenomenological method, especially evident, Cairns shows, in Husserl's exploration of what, in his Logical Investigations, he refers to what the "cautiously shrewd person" does when faced with what is believed to be showed turns out to reveal the basic features of that method. Our already acquired familiarity, in short, especially when matters are vitally important, provides the soundest clue to understanding what Husserl frequently called the fundamental principle of phenomenological method.In his other writings—most unpublished in his lifetime—Cairns similarly elucidate others of Husserl's central ideas, and beyond that extends his carefully worked out reflections to other issues, including important concepts in ethics and value theory. Of equal importance, I think, are Cairns remarkable translations of Husserl's at time quite difficult texts, making what would otherwise be inaccessible to us.