This book is a select collection of seminal writings by Michael Soule over a thirty-year time-span from 1980 through the present day. Previously published in books and leading journals, these carefully selected pieces show the progression of his intellectual thinking on topics such as genetics, ecology, evolutionary biology, and extinctions, and how the history and substance of the field of conservation biology evolved over time. It opens with an in-depth introduction by marine conservation biologist James Estes, a long-time colleague of Soule's, who explains why Soule's special combination of science and leadership was the catalyst for bringing about the modern era of conservation biology. Estes offers a thoughtful commentary on the challenges that lie ahead for the young discipline in the face of climate change, increasing species extinctions, and impassioned debate within the conservation community itself over the best path forward.--