Edward "Ed" Rosenthal is an American horticulturist, author, publisher, and Cannabis grower known for his advocacy for the legalization of marijuana use. He served as a columnist for High Times Magazine during the 1980s and 1990s. He was arrested in 2002 for cultivation of cannabis by federal authorities, who do not recognize the authority of states to regulate the use of medical marijuana. He was convicted in federal court, but the conviction was overturned on appeal. Rosenthal was subsequently convicted again, but was not re-sentenced, since his original sentence had been completed.

High Times is an American monthly magazine that advocates the legalization of cannabis as well as other counterculture ideas. The magazine was founded in 1974 by Tom Forcade. The magazine had its own book publishing division, High Times Books, and its own record label, High Times Records.