Jan Gehl is an architect and urban planner who is known for his research on how to make cities better places to live. He believes that cities should be designed in a way that allows people to move around easily, while also giving them places they can relax and enjoy. To do this, he suggests changing how roads and sidewalks look, adding parks and other public spaces, and making sure that buildings are built to let in enough natural light. He also thinks that cities should have more street life, with places to sit and socialize, and small shops and restaurants to add life to the neighborhood. In short, Jan Gehl wants to make cities more enjoyable for people to spend time in and use.