The Impact Investing Handbook (Rockefeller Philanthropy Advisors) is included because it is a practical, practitioner-focused guide for asset owners—individuals, families, foundations, and corporations—offering case studies, input from over fifty experts, and downloadable full text to help turn interest in impact investing into action. Its explicit framing of the Why (develop a theory of change), How (build or shift portfolios with impact tools), So What (measure success using leading frameworks), and Now What (implement realistic plans) directly supports Part 2: The Purposeful Investment Landscape by providing the intentionality, measurement approaches, and implementation tactics that Wealth With A Why emphasizes for translating impact goals into investable strategies.