Diana "D.D." Tyler is a natural history artist noted for her fine detail, scientific accuracy, and distinctive style. She has illustrated 15 books including "Bears of the World", "Keeper of the Animals", "A Field Guide To Whales", and "Porpoises and Seals of the Gulf Of Maine and Eastern Canada". Over the years, D.D. and Liberty Graphics have collaborated to print over 150 (and still counting) pieces of her nature art.