Matthieu Ricard is an ordained Buddhist monk and an internationally best-selling author of books about altruism, animal rights, happiness and wisdom. His humanitarian efforts led to his homeland’s awarding him the French National Order of Merit. (Ricard’s primary residence is a Nepalese monastery.) He was the Dalai Lama’s French interpreter and holds a Ph.D in cellular genetics. In the early 2000s, researchers at the University of Wisconsin found that Ricard’s brain produced gamma waves — which have been linked to learning, attention and memory — at such pronounced levels that the media named him “the world’s happiest man.”