William Braunstein, professionally known by his stage name Ill Bill, is an American rapper and record producer from Brooklyn, New York City. Having gained fame in the underground hip hop group Non Phixion, Ill Bill is known for his diverse lyrics and as the producer, founder and CEO of Uncle Howie Records. His brother Ron is rapper and producer Necro.

Non Phixion is an American hip-hop group from Brooklyn, New York City. Though the group did not become a household name during their initial period of activity, the Village Voice said Non Phixion was "integral to the timeline of underground hip-hop." The group endured a series of missed opportunities on their way to their only LP release and broke up after their first decade. In the months leading up to the 20th anniversary of their formation, the group reunited and as of 2021 was still active and touring. Their logo is a direct nod to the Canadian metal band Voivod.