We were saddened and deeply shocked to learn of the death of Dr Jeroen Ensink, following an attack outside his home in London on Tuesday 29 December 2015. Our deepest condolences go to his family and friends. Dr Ensink was Senior Lecturer in Public Health Engineering at the London School of Hygiene and Tropical Medicine. He was passionately committed to improving access to water and sanitation in countries where people die needlessly from preventable diseases, due to the lack of these basic services. Jeroen’s work took him around the world, living and working in various Asian and African countries including Pakistan, India, Vietnam, Tanzania and Malawi, and he worked with many international agencies including WaterAid. Henry Northover, WaterAid’s Global Head of Policy, said: “Jeroen was an unforgettable man. His work was amongst the best in international development. He had an unshakeable commitment to serving those least able to fend for themselves. “He had a great intellect – open, honest, innovative and always questioning orthodoxies. His work was resolutely committed to serving the interests of wider humanity. Above all, he was warm, quick-witted and great company. “It is deeply tragic that someone so resolutely committed to saving the lives of others should have his own life taken in such a cruel way. We hope that his life and his works will continue to inspire others. “Our deepest and heartfelt sympathies go to his colleagues and his wife Nadja and family.” WaterAid will pay tribute to Jeroen’s work through our continued relationship with the London School of Hygiene and Tropical Medicine, as we continue to work to reach everyone everywhere with clean, safe water, toilets and hygiene.