Daniel is a chartered engineer, chartered environmentalist, teacher, visionary, and distinguished fellow of the Schumacher Institute. He founded Splendid Engineering, chaired the IMechE Energy Environment and Sustainability Group, established Transition Engineering with Susan Krumdieck, and co-founded The Global Association for Transition Engineering. Daniel specialises in whole-system change towards sustainability, creating solutions rather than selling technology. In 2003, he built the Splendid Eco-Car project, and in 2013, he co-authored the IMechE Transport Hierarchy policy framework.