The Impact Investor explains in unprescedended detail what the practice of impact investing entails through the experiences and proven practices of 15 of the worlds most successful impact investors. The book will provide financial professionals, students and business interests with the information they need to capitalize on the impact investing opportunity, including historical context, insights into investment and fundraising strategies, and deal-level intelligence. Organized into 10 chapters, the book focuses on the implementation of "Big Ideas" in impact investing such as Policy Symbiosis, Mission First and Last, and Catalytic Capital. Each Big Idea is followed by the investment innovation used to successfully implement it, e.g. Public Private Partnership, Mission Lock and Innovation Clusters. The ideas and tools feature lessons learned from an in-depth two year research project undertaken by the authors with over half a million dollars in funding from the Omidyar Network, Deutsche Bank, the F.B. Heron Foundation, the Annie E. Casey Foundation and other private foundations. Includes a diagnostic for assessing key skills, styles of working and problem-solving required for impact work drawn from the authors' own cases. The diagnostic is based on a framework from a nationwide survey the authors conducted of professional development skills for the social sector and proprietary maps of the impact investing field developed by Cathy at CASE for students.