Dr. Charly Kleissner is a pioneer in the field of impact investment. He believes that the deeper meaning of wealth is to make a positive contribution to humanity and the planet. Dr. Kleissner co-founded KL Felicitas Foundation (www.klfelicitasfoundation.org), and Social-Impact International (www.social-impact.org), which help social entrepreneurs worldwide to accelerate and increase their impact.  Dr. Kleissner co-founded Toniic and the 100% Impact Network, global networks for impact investors. Dr. Kleissner serves as Chairman of the Advisory Board of the Global Hub Company (www.the-hub.net), and as Board Director and Chairman of the Investment Committee of ImpactAssets.In this extended and wide-ranging interview, Charly paints an exciting picture of the state of impact investment today, talks about the importance of “deep impact investing”-and shares his abiding belief in the potential of changing the financial system to build a better world. Charly talks about his experience at TONIIC and the 100% impact network and highlights the results that have been achieved at the KL Felicitas Foundation (that impact investors can construct a 100% impact portfolio and achieve competitive financial returns in all asset classes while making a big impact). Charly highlights some of the important work the Foundation is doing supporting the impact investment ecosystem. Finally, he discusses how modern portfolio theory should be re-conceptualized to integrate positive impact. (This is an edited version of an interview posted on the Financing Social Entrepreneurs podcast.)