Mohan Rao is Professor at the Centre of Social Medicine and Community Health, Jawaharlal Nehru University, New Delhi, India. A medical doctor specializing in public health, he has written extensively on the history and politics of health and population.

Sara Parkin is a Principal Associate with The Sustainability Literacy Project and a new board member of the British-based Population Matters. She has written several books, the latest being The Positive Deviant.