Hal Donell Williams Jr., known professionally as Pyramid Vritra, is an American rapper and record producer. Aside from their solo career, they initially rose to fame as a member of Los Angeles–based hip hop collective Odd Future via the sub-group The Jet Age of Tomorrow alongside Matt Martians, and Atlanta-based hip hop collective NRK. They are one half of transatlantic hip-hop duo Wilma Vritra alongside Wilma Archer. They have released music under Stones Throw Records, Alpha Pup's The Order Label, and Bad Taste Records.