Our people have extensive experience in various disciplines such as power generation, marine propulsion, field engineering and customer service. The knowledge base is clearly reflected in their work ethic, devotion, attention to detail and outstanding services offered to customers.

Warren Zemlak

President & Chief Executive Officer
Warren Zemlak has served as Vericor's President & Chief Executive Officer and a Director since June 2023. Warren also serves as BJ’s Chief Executive Officer and a Director since January 2017. With more than 34 years of experience, Warren has held various senior leadership and executive roles in operations, technology, and manufacturing related to cementing, hydraulic fracturing, coiled tubing, artificial lift, and completion services.

Prior to Vericor and BJ, Warren served as Chief Operating Officer at Sanjel Corporation. Prior to Sanjel, Warren held various North American and International assignments with Schlumberger for 21 years, most recently as Vice President – Well Services – North America. Warren’s operational and technical expertise has resulted in multiple innovations including patents related to reservoir stimulation, subsea intervention, and drilling technology. Warren currently serves as a Director-at-Large for the Energy Workforce and Technology Council.

Ernesto Bautista III

Vice President & Chief Financial Officer
Ernesto Bautista joined Vericor in August 2023 as Vice President & CFO. Ernesto also serves as BJ's Chief Financial Officer since August 2021. With more than 28 years of Financial Executive experience, Ernesto has an extensive corporate strategy, financial management, and analysis background culminating into a proven track record in identifying and exploiting opportunities to maximize economic returns. Prior to BJ, Ernesto served as Vice President, Chief Financial Officer, and Treasurer of CARBO Ceramics Inc. (NYSE: CRR). Prior to joining CARBO, Ernesto served in several senior management roles at W-H Energy Services, Inc. (NYSE: WHQ), ultimately serving as Vice President and Chief Financial Officer prior to the Company's sale to Smith International Inc. Ernesto is a Certified Public Account in Texas and holds Bachelor's and Master's degrees from Rice University.

Umberto Marseglia

Chief Commercial Officer (CCO)
In 2016, Mr. Umberto Marseglia joined Vericor as Chief Marketing Officer. Prior to joining Vericor, Mr. Marseglia was VP of Global Business at Calfrac Well Services for 4 years, founder and board director of a successful E&P, SunGod Resources, Alberta President of the “Mexican Talent Network” and prior to that he worked for more than 22 years at Schlumberger Oilfield Services where he held various key management positions in the oil industry in Latin America, USA, Europe, Africa and Middle East. Dr. Marseglia received his degree as Doctor in Mechanical Engineering from Politecnico of Milan (Italy) in 1988 and graduated in 2000 in School of Business Administration at Harvard University in Strategic Marketing.

Vinayak Barve

Vice President Engineering
Vinayak Barve was promoted to VP of Engineering in May 2022. Vinayak started at Vericor Power Systems in March 2016 as the Chief Engineer, where he was responsible for engineering design and development at Vericor. He oversaw the introduction of the Vericor Gas Turbine in the direct drive frac application, and the development of low emissions combustors. Prior to Vericor, Vinayak worked at Siemens Energy in Orlando, FL on Large Gas Turbines in the combustion Design Group. Dr. Barve has a PhD. and MS in Mechanical Engineering from the University of Texas at Austin, and a BE in Mechanical Engineering from University of Pune.

Jeff Jajack

Vice President Operations
Before joining Vericor in March 2020, Mr. Jeff Jajack worked as a Senior Program Manager and Business Development Manager for KBR. He spent over 15 years with Honeywell serving in various leadership positions in operations and supply chain. Prior to that, Mr. Jajack worked for GE Aviation in operations and engineering roles. He is a certified Six Sigma Black Belt and Project Management Professional (PMP). Mr. Jajack is a former U.S. Army officer where he served in various tank battalions. He holds Bachelor of Science degree in Engineering Management from the U.S. Military Academy and an MBA from Oklahoma State University.