John Harkrider, President
John D. Harkrider is President of Sigma Cubed Inc. (SIGMA³). An expert with 30 years of experience delivering break-through completion and stimulation optimization, John specializes in using new techniques to help clients achieve the drilling, completion and stimulation effectiveness on horizontal wells. Prior to the SIGMA³ acquisition, John served for seven years as a principal of APEX Petroleum Engineering, Inc. where he helped clients improve their well completions throughout the U.S. and overseas.
Before joining APEX PE, John worked seven years as a drilling engineer at Texaco, gaining valuable experience in many basins around the world. A distinguished author of more than 25 technical papers, articles and topical reports on state-of-the-art completion practices, John as also taught more than 30 industry schools on hydraulic fracturing mechanisms.
John holds a B.Sc. in Petroleum Engineering from the Colorado School of Mines, and a degree in Chemical Engineering from the University of Colorado. He is a member of the Society of Petroleum Engineers (SPE).