He is editor-in-chief of the American Horticultural Society's Encyclopedia of Perennials and the author of more than twenty books, and he runs the Royal Horticultural Society's New Plants blog as well as his Transatlantic Gardener blog.
He has been the gardening correspondent of Britain's Observer and Evening Standard newspapers and contributes frequently to the RHS's magazines The Garden and The Plantsman; he has also written for all the top gardening magazines on both sides of the Atlantic, including Horticulture, Garden Design, BBC Gardeners' World, and Country Life.
A widely respected plantsman, Graham trained at the prestigious Royal Botanic Gardens, Kew, is a member of the RHS's committee on herbaceous plants (judging their trials of both annuals and perennials), and also judges at the Chelsea Flower Show.
He divides his gardening time between Pennsylvania and England with his wife, American garden writer and photographer judywhite.
You may also be interested in the author's own Web site, TransatlanticPlantsman.com.