Dr David Sainsbury is a veterinarian that was formerly lectured in Animal Health at the University of Cambridge. He is well known and respected by the poultry industry as a writer, lectured and adviser, and has traveled extensively as a specialist adviser throughout the world, including USA, Russia, Scandinavia, Germany, Italy, South Africa, Angola, Iran, Cyprus, Iraq, Greece, Holland, Belgium, and France. He is also examiner in Animal Health at the several universities, and in a number of overseas countries.