Corporate Officers

Image - Claudette D. Beyer

Claudette D. Beyer

Claudette D. Beyer, Chief Executive Officer & Chair of the Board, directed HTRI’s relocation from California to College Station, Texas (TX), USA (1989 – 1990), the construction of the first Texas-based research facility (1990 – 1992), and the first office building owned by HTRI (2000). That same year, HTRI established an office in Guildford, UK. In 2007 construction of the first wholly owned corporate headquarters began. HTRI was the anchor tenant in the Navasota (Texas) Business Park, purchasing nearly 28 of 70 acres. In 2008 Beyer approached the United States Federal Trade Commission and Department of Justice as a friendly party to an anti-trust charge, ultimately leading negotiations for an alliance with Honeywell. Ongoing focus includes product acquisitions, collaborations, and expanding ventures leading to more diversified offerings, capabilities, and corporate growth. Beyer’s career spans over 35 years in industry, government, and academia, including The University of Chicago Pritzker School of Medicine, North Dakota (ND) Governor’s Council, City of Aurora, Colorado, and North Dakota State University. Beyer has an MA in Organizational Communications from the University of North Dakota. She has served on the boards of several professional organizations, including the ND Council for the Disabled, National Council of University Research Administrators, The Council for Women in Higher Education, and the Society of Research Administrators as Chair of the Board of Advisors and subsequently, President. In 2009 she served as President of the Heat Transfer Society of the United Kingdom.


Image - Juan M. Diaz

Juan M. Diaz

Juan M. Diaz, President & Chief Operating Officer, graduated with a BS in Finance from Louisiana State University, Baton Rouge, Louisiana (LA), USA. He worked as an Audit Manager at Arthur Andersen LLP in Houston, Texas (TX), USA, for six years before moving into corporate accounting. At O.I. Corporation in College Station, TX, Diaz served as Vice President, Principal Accounting Officer, and Corporate Controller. After a brief stint as Director of SEC Reporting at The Shaw Group Inc. in Baton Rouge, LA, he joined The Hospice Foundation of Greater Baton Rouge as their Chief Financial Officer. His nearly fifteen years of experience in a broad array of accounting functions and business environments gives him unique insight into the financial structure of a for-profit consortium like HTRI. Diaz is a Certified Public Accountant (CPA) in Texas.


Image - Mike Creagor

Mike Creagor

J. Michael Creagor, Vice President, Research & Technology Center & Facilities Operations, directs the construction, modification, operation, and maintenance of HTRI test units at the RTC and oversees facilities operations at our corporate complex. Creagor was hired just as we were closing down our technical facilities in California and bringing our first Texas-based facility on-line. He directed the closing of the California technical facilities and the move of the remaining rigs to Texas, where he since has managed the technical test/research operations. Creagor served as the general contractor during construction of the new facility, the Research & Technology Center, HTRI’s first wholly owned technical facilities. He is responsible for our regulatory compliance and safety, ensuring that we observe all applicable environmental laws and regulations. Creagor has over 35 years of experience in plant operation, construction, project supervision, and related maintenance skills.


Image - Tom Lestina

Tom Lestina

Thomas G. Lestina, Senior Vice President, Engineering, has more than 30 years of engineering project management experience. He directs HTRI's contract and consulting services, as well as oversees research and technical support. Lestina also assists in developing and customizing training and teaches courses. He earned a BS in Mechanical Engineering from Union College, Schenectady, New York, USA, and an MS in Mechanical Engineering from Rensselaer Polytechnic Institute, Troy, NY. Prior to joining HTRI, he worked as a Lead Engineer for MPR Associates, Inc., Alexandria, Virginia, USA. Besides being a member of ASME, he serves on the technical committee for the ASME Performance Test Code 12.5, Single Phase Heat Exchangers. He is a licensed Professional Engineer (PE) in Texas.


Image - Hans U. Zettler

Hans U. Zettler

Hans U. Zettler, Vice President, Global Sales, joined HTRI while completing his PhD in Chemical Engineering at the University of Surrey, Guildford, UK, under his advisor Hans Müller-Steinhagen. His doctoral work focused on fouling and design of compact heat exchangers. He also possesses a mechanical engineering degree (Dipl.-Ing.) from the Technical University Karlsruhe, Germany. Zettler completed multiple internships in industry throughout Europe while pursuing his education. He oversees HTRI’s sales operations globally - including Europe, Russia and the Commonwealth of Independent States (CIS), and the Middle East, and Africa (EMEA). Zettler is a member of the German Engineering Society (VDI), a member of the VDI-GVC Working Party on Heat and Mass Transfer, an associate member of the Institution of Chemical Engineers (IChemE), and a committee member of the Heat Transfer Society, United Kingdom.