Warren Zemlak has served as BJ Services' President and Chief Executive Officer since January 2017. With more than 30 years of experience, Mr. Zemlak has held various senior leadership and executive roles in operations, technology, business development and manufacturing related to cementing, hydraulic fracturing, coiled tubing and completion services.

Prior to joining BJ, Mr. Zemlak served as President and Chief Executive Officer of Allied Energy Services. Previously, he served as Vice President of Well Services and Senior Vice President of Production Services at Schlumberger where he was responsible for pressure pumping, completions and artificial lift.

Mr. Zemlak’s technical and operational expertise has resulted in several patents related to reservoir stimulation, subsea intervention and horizontal drilling technology. Additionally, Mr. Zemlak has led several business optimization initiatives in both public and private entities.

Caleb Barclay has served as BJ Services' Executive Vice President and Chief Operating Officer since January 2017. Mr. Barclay has more than 16 years of industry experience and holds a Bachelor of Science in Bio-Resource Engineering from Colorado State University.  He began his career in the Permian Basin as a field engineer in fracturing for Schlumberger, and has since held senior management positions with Sanjel USA, overseeing fracturing, cementing, coiled tubing operations, supply chain, engineering and sales. Prior to joining BJ, Mr. Barclay served as Chief Operating Officer of Allied Energy Services.

John Bakht has served as BJ Services' Executive Vice President and General Counsel since June 2017. With his extensive experience as a business lawyer in the oil and gas industry, he heads our legal affairs and also serves as the Chief Compliance Officer and Corporate Secretary. 

Mr. Bakht spent more than half of his career at Baker Hughes Incorporated, where he held several senior roles including Vice President – Legal. Immediately prior to joining BJ, he served as vice president, General Counsel, Chief Compliance Officer and Corporate Secretary of CARBO Ceramics Inc. 

Mr. Bakht holds a Bachelor of Business Administration degree in Economics from the University of North Carolina and a Juris Doctor degree from the University of Texas School of Law. He is licensed to practice law in Texas.