Gulfstream IV / G350 / G450
Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 90; Flight Crew Total 11500; Flight Crew Type 900
Inflight Event / Encounter Loss Of Aircraft Control; Inflight Event / Encounter Wake Vortex Encounter
Air Traffic Control Issued New Clearance; Flight Crew Regained Aircraft Control; Flight Crew Took Evasive Action
Environment - Non Weather Related; Procedure
We were in a climb 'Direct' to DRK VOR in the vicinity of PSP at .75 Mach going through about FL340 climbing to FL410 when we encountered an upset from wake turbulence. Autopilot and yaw damper disengaged. The aircraft rolled about 45 degrees left with moderate to severe turbulence.  I manually steered the aircraft to the left off course and we advised ATC of the encounter. ATC responded that we were following a 'Heavy Jet Ahead' (I believe it was an MD-11) and the ATC authorized an offset. We re-engaged the automation with a 2 NM left lateral offset.
Gulfstream IV Captain reported an upset with a 45 degree bank from wake turbulence in trail of an MD-11 at FL340.