Dan Raven-Ellison is a parent, guerrilla geographer, National Geographic explorer, former geography teacher and led the campaign to make London the world's first National Park City. His work focuses on challenging himself and others to see the world in new ways. He does this by combining creative exploration, geography and communication to tackle social and environmental challenges. Dan is helping people from different cities around the world who are working towards making their cities National Park Cities. He is also working on Slow Ways, an initiative to create a network of walking routes that connect all of Great Britain's cities.