John Waterlow was a prominent British physician and nutritionist known for his contributions to the field of nutrition science. He is best recognized for developing the Waterlow classification, a system used to assess malnutrition and body composition. His work has had a lasting impact on public health, particularly in understanding the nutritional needs of vulnerable populations. In addition to his research, Waterlow served as a professor at University College London, where he educated future generations of health professionals. His dedication to improving nutritional standards and health outcomes has made him a significant figure in the study of human nutrition.