MIT Solve has announced Hala Hanna as its new executive director. Solve is a marketplace for social impact innovation with a mission to drive innovation to solve world challenges. Hanna has more than 15 years of experience working across the public, private, and nonprofit sectors, with the purpose of creating a more equitable and sustainable world. She spent the last six years at MIT Solve, where she helped build the initiative into a global community. Solve uses open innovation challenges to find the most promising tech-based social entrepreneurs worldwide, with…