Penthouse, purchased the Playboy Mansion, and opened the first Playboy Club on the Near North Side of Chicago. Throughout the Sixties, Hef and Playboy became what Chicago columnist Bob Greene has called "a force of nature." Hef wrote an extended series of editorials titled "The Playboy Philosophy," championing the rights of the individual and challenging the country?s heritage of puritan repression. By 1971, when Playboy Enterprises went public, the magazine was selling 7 million copies a month and there were 23 Playboy Clubs, resorts, hotels and casinos with more than 900,000 members worldwide. Hef established a second residence in Los Angeles, which quickly became known as Playboy Mansion West, and in 1975 decided to settle there permanently. In 1980, Hef championed the reconstruction of the Hollywood sign (then in serious disrepair) and was honored with a star on the Hollywood walk of fame for his efforts. Since the mid-Eighties, daughter Christie Hefner has served as Chairman and Chief Executive Officer of Playboy Enterprises, but Hef continues to serve as the magazine?s editor-in-chief.