Ed Rosenthal is the world's leading expert on marijuana. In his more than forty years as the "guru of ganja," he has written or edited more than a dozen books about marijuana cultivation and social policy that cumulatively have sold over two million copies. His "Ask Ed"(R) marijuana advice column ran in High Times for several decades and still appears internationally. One of his books on marijuana cultivation is the only book of its type to be reviewed by The New York Times. He is also on the faculty of Oaksterdam University, the leading trade school for the cannabis industry. His classes teach pupils how different techniques can be used to improve the yield and efficiency of their gardens. Beyond the garden, Rosenthal views marijuana law as a crucial social issue and has been active in promoting and developing policies of civil regulation. He lives in Oakland, CA.