KRS-One (born Kris Parker) was the leader of Boogie Down Productions, one of the most influential hardcore hip-hop outfits of the '80s. At the height of his career, roughly 1987-1990, KRS-One was known for his furiously political and socially conscious raps, which is the source of his nickname, "the Teacher." Around the time of 1990's Edutainment, BDP's audience began to slip as many fans thought his raps were becoming preachy. As a reaction, KRS-One began to re-establish his street credibility with harder, sparer beats and raps.