Some street artists have earned international attention for their work and have made a full transition from street art into the mainstream art world — some while continuing to produce art on the streets. Keith Haring was among the earliest wave of street artists in the 1980s to do so. Traditional graffiti and street art motifs have also increasingly been incorporated into mainstream advertising, with many instances of artists contracted to work as graphic designers for corporations. Graffiti artist Haze has provided font and graphic designs for music acts such as the Beastie Boys and Public Enemy. Shepard Fairey's street posters of then-presidential candidate Barack Obama were reworked by special commission for use in the presidential campaign. A version of the artwork also appeared on the cover of Time magazine. It is also not uncommon for street artists to start their own merchandising lines.