Bernice Brewster is an aquatic consultant with a major interest in the koi hobby. Nick Fletcher is the former editor of the UK aquatic monthly Practical Fishkeeping and a regular contributor to fish-related publications. Steve Hickling is a leading authority on koi and pond construction. Keith Holmes is manager of Koi Water Barn in Kent, England, with a deep knowledge of koi health. Mick Martin, a koi-keeper for more than 20 years, has practical experience of koi husbandry through breeding and buying in Japan. Tony Pitham is the owner of Koi Water Barn and one of the most respected koi dealers working in Japan.
Dr. Peter Burgess is a university lecturer specializing in ornamental fish. His PhD was in research on whitespot disease in tropical marine fish. Dr. Paula Reynolds is an aquatic pathobiologist and proprietor of Lincolnshire Fish Health Laboratories and Research Centre, which carries out health screening on koi from around the world.