Place_holder Cynthia Lynn - President
Mrs. Lynn is an established entrepreneur having launched Thunderhead Testing, LLC, in 2000 as a platform from which to provide data management services for the Pavement Test Track facility of the National Center of Asphalt Technology at Auburn University. A respected authority in asphalt technology, mixture design and testing, she currently serves as president of the firm. Mrs. Lynn’s areas of technical competence include aggregate and asphalt testing. Past and current research engagements include Majeska & Associates, MeadWestvaco Corp., and Oklahoma State University.
Prior to forming Thunderhead, Mrs. Lynn held various technical positions with Pavement Technology, Inc., Atlanta Testing and Engineering, and the National Center for Asphalt Technology at Auburn University where she earned her M.S.in Civil Engineering in 1996. Her published researchaccomplishments include evaluation of steel and chrome slag aggregates for use in bituminous mixtures and characterization of aggregate materials for use in bituminous mixtures. She also holds B.S. degrees in Civil Engineering and Engineering Science from Tennessee Technological University (1993) and David Lipscomb University (1991) respectively.
Place_holder Todd A. Lynn, P.E. Ph.D. - Principal
Dr. Todd Lynn is a respected authority in asphalt technology, mixture design and testing. He currently directs and manages the technical operations of Thunderhead Testing, LLC, a construction materials design and testing firm that his wife founded in 2000. Dr. Lynn’s areas of competence include aggregate and asphalt testing, asphalt mixture design development, research and product development of asphalt systems including green technologies such as warm-mix asphalt, reclaimed asphalt pavement and asphalt shingles. Past and current research engagements include Majeska & Associates, MeadWestvaco Corp., and Oklahoma State University. He also provides consultation and training services to national and international companies. Prior to joining Thunderhead full-time in 2010, Dr. Lynn held various technical positions with Oldcastle Materials, SemMaterials, APAC, and the National Center for Asphalt Technology at Auburn University where he earned his Ph.D. in 2002. His published research accomplishments include characterization of modified asphalts and development of a mix design procedure for SMA mixtures. While with APAC, he was associated with numerous paving projects including the construction of the Kansas Speedway.
Place_holder Patsy Rorex - CFO
Mrs. Rorex is currently the Chief Financial Officer of Thunderhead Testing, LLC. She has over 30 years of experience in business administration, accounting and finance. Prior to joining Thunderhead as CFO, Mrs. Rorex held various finance and management positions withHembree-Rorex Insurance and Conway-Rorex Property Management companies. Mrs. Rorex received her B.A.from David Lipscomb University in 1966.
Place_holder Corey Christian
Corey has worked in the asphalt industry for over 5 years. He currently holds certifications in Oklahoma for: Aggregates and Concrete. In Texas, he holds certifications for: 1A Plant Production Specialist and Mix Design. His scope of work experience includes material processing, aggregate testing, R&D, and mix design. Corey has a bachelor’s degree in Business Management. He joined Thunderhead Testing, LLC, in March of 2012 where his roles have included research in various areas of asphalt mixtures including cutting edge technologies in WMA.
Place_holder Lincoln Beard
Lincoln has been a lab technician for Thunderhead Testing since September 2012. Lincoln grew up in central Louisiana and after graduating high school attended Louisiana Tech University. He graduated in Spring 2012 with a Bachelor's degree in Industruial Engineering. While in college he participated in projects for Procter and Gamble and Lockheed Martin. In October 2012 Lincoln earned his Aggregate Certification from Oklahoma Department of Transportation.
Place_holder Darryl Harvey
Darryl began his career in construction materials testing with Thunderhead in January 2013. He has an extensive background in logging and sawmill operations producing a variety of wood products. His capabilities also include heavy equipment operation. An avid outdoorsman, Darryl is also an accomplished taxidermist. Darryl holds OKDOT certification for Materials Sampling and Testing. He has quickly become proficient in field construction materials testing involving aggregate, concrete and asphalt. In the lab, he has experience with both hot and warm mix asphalt technologies. His role at Thunderhead also includes that of equipment manager and maintenance of the firm’s vehicle fleet.
Place_holder Isaac Bell
Isaac began his career in construction materials testing with Thunderhead in January 2011 while still a high school student. He has gained extensive experience in hot and warm mix technologies since that time. His role at Thunderhead includes a variety of laboratory testing and asphalt performance test specimen preparation. He also assists with management of equipment maintenance and the vehicle fleet. He is currently a student at the Oklahoma State University Institute of Technology where he is pursuing a Bachelor’s degree in Civil Engineering Technology. As part of his study curriculum, Isaac is completing an OSU-IT internship with Thunderhead.
 
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