Carl May is Professor of Health Systems Implementation at the London School of Hygiene and Tropical Medicine, UK and is an Honorary Professorial Research Fellow in the Department of Primary Care at Melbourne University in Australia. Carl works closely with clinical researchers and his work has focused on developing a richer understanding of the development and implementation of innovative healthcare technologies, and other complex healthcare interventions. His work in this field includes leading the projects to develop Normalization Process Theory (NPT) and Burden of Treatment Theory (BoT). NPT and BoT help us to understand the factors that promote and inhibit the effective adoption, implementation, and integration of clinical innovations in healthcare. They have informed more than 800 published studies with many more currently in progress.