David Castellan, DVM, MPVM, ACPVM, is a veterinarian at the Institute for Infectious Animal Diseases, serving as an international animal health subject matter resource expert and epidemiologist for the Veterinary Field Epidemiology Training Program with international stakeholders. From 2008 to 2015 he was the Senior Veterinary Epidemiologist, FAO ECTAD, Region of Asia and Pacific where he was engaged in supporting the development of regional epidemiology capacity, including the Field Epidemiology Training Program for Veterinarians (FETPV) training centers in Thailand, China and Indonesia as well as delivering FETPV training programs in Southeast and South Asia countries. He holds the degrees: Doctor of Veterinary Medicine, University of Guelph; Master of Preventive Veterinary Medicine and Poultry Medicine Residency, University of California, Davis; and is board certified with the American College of Veterinary Preventive Medicine and the American College of Poultry Veterinarians. Additional professional contributions in Canada, USA, Asia, Africa and the Caribbean, include the development and delivery of: 1) country contingency plans for avian influenza; 2) an avian influenza vaccination planning tool; 3) an epidemiology mapping tool; 4) the Tripartite Joint Risk Assessment Methodology; and 5) outbreak investigations, surveillance and field research studies in developed and developing countries. His work supports evidence-based decision-making using epidemiology and poultry medicine to promote human health, animal health and food security using a One Health approach.