Colby founded Multiplier Advisors with a vision for a more relational approach to impact investing. Led by this vision, Multiplier Advisors helps health-focused institutions from across industries identify and articulate shared aims, and create strategies for investing together in social determinants of health (SDOH) with measurable social and financial returns. Before launching Multiplier Advisors, Colby helped launch the Build Healthy Places Network (BHPN), building the national center at the intersection of community development and health.

Prior to BHPN, she created the Impact Investing Policy Collaborative, a network of researchers, investors and policymakers from over 30 countries that led to a global launch of policy principles. Colby also co-founded what is now Grounded Solutions Network, the national trade association for shared equity homeownership programs and community land trusts. She holds a Masters in Public Policy from UC Berkeley.