It takes the power of many to build a city; it takes the power of together to grow a urban ecosystem that fosters innovation and serves social and environmental impact. This panel featuring Michele Osella (Fondazione Compagnia di San Paolo), Matteo Pessione (OGR Tech, Fondazione CRT) and Karen Wilson (GV Partners) introduced how a diverse set of competencies and collaboration among a plurality of city stakeholders on joint projects can align in making a city a frontrunner in social innovation.