David Gerald Hessayon OBE (born 1928) is a British author and botanist of Cypriot descent who is known for a best-selling series of paperback gardening manuals known as the "Expert Guides" under his title Dr. D. G. Hessayon. The series started in 1958 with Be Your Own Gardening Expert and in 2008 it celebrated its 50th anniversary and the 50 millionth copy in print. They have become the best selling gardening books in history. Source: Wikipedia (en)