Career
Recently he has been working with Google X and other groups on a project to end human stunting through better nutrition worldwide, starting in Africa. He is the author of four books:
Great Moments in Chocolate History: With 20 Classic Recipes From Around the World (2015)
Chocolate: History, Culture, and Heritage (2009)
Gardening for the Future of the Earth (2000)
Gardencycle: A Gardener"s Day Journal (2000).