Constantinos Petrinos is a full time professional underwater photographer. He was born in Athens in 1961 and spent his early childhood in Cameroon, Africa. While growing up he aspired to become a marine biologist but more practical considerations led him to business studies. He obtained a Master's in Business Administration from Dartmouth College in the USA. A while ago he decided to free himself from business suits and suffocating ties and dive the world's oceans. His photographs have won awards at many competitions, including the BBC Wildlife Photographer of the Year. His articles have appeared in various magazines, such as BBC Wildlife, Tauchen, Der Spiegel, Dive, Oceans Illustrated and the Greek editions of National Geographic and National Geographic Traveller. He is the photographer on location for the Hellenic Institute of Marine Archaeology, which conducts underwater excavations in conjunction with the Greek Ministry of Culture. Constantinos is the underwater photography expert for the Nikon Owners Club International. Throughout the year, Constantinos conducts slide shows in Greek schools, to promote marine awareness. He is a Fellow of the Royal Photographic Society. Constantinos prefers to stay on location for a minimum of two months when working on major projects. He believes that you need to spend many hours underwater to familiarise yourself with the particular habitat and the species present in order to be able to capture behavioural scenes on film. For his book, Realm of the Pygmy Seahorse, he spent five months in Sulawesi and took 25,000 slides.