Grandmixer DXT - allegedly the first guy to scratch and first "turntablist", when he scratched to "Rockit" (by Herbie Hancock). That was in 1984....
Looks like Herc was around earlier as a DJ, but it doesn't mention him scratching... so maybe DXT wasn't the father of hip hop as such, but perhaps turntablism? Definition bashing here!
DXT was part of Zulu Nation, along with Flash, Bambaata, Jazzy Jay etc...