What should a city be? Ron Buliung, a geography professor who studies urban mobility, describes why he’s an advocate for making our metropolises more accessible for people with disabilities. Emily Reisman, an urban planner, studies how to make highrise communities more appealing. John Robinson, a Munk School professor, argues for a new emissions-fighting strategy for cities. And Meric Gertler explains how the new School of Cities is uniquely positioned to help the world build better cities.