Don Anschutz CEO

Richard Derbawka CFO/COO

Ian J. Renkes Manager of Operations and Business Development

Mr. Renkes has 10 years’ experience working in the oil and gas industry. His work experience includes resin research, new product development, engineering, field services, new procedure development, and quality management. In his current responsibilities at PropTester, Mr. Renkes oversees the day to day operations of all lab and field work.

Mr. Renkes earned his B.S. in Chemical Engineering Cum Laude at Texas Tech University. While there, he was an active member in the Society of Petroleum Engineers (SPE) and American Institute of Chemical Engineers (AIChE). He is currently a member of both SPE and AIChE and he sits on the ISO 13503-2 Technical Committee Procedures for measuring properties of proppants used in hydraulic fracturing and gravel packing and ISO 13503-5 Technical Committee Procedures for measuring the long-term conductivity of proppants. Mr. Renkes received his PMBA from Texas A&M University in May of 2014.

Michelle Stribling Sales and Marketing Manager

Michelle Stribling serves as the Manager of Sales and Marketing for PropTester in Houston, Texas. Michelle has spent her entire career in the energy industry. Raised in Midland, Texas, she worked at the Permian Basin Petroleum Museum ultimately serving as the Director of Marketing. Michelle was then hired by Cadre Proppants (now part of US Silica) and relocated to their headquarters in Houston, TX. While at Cadre, Michelle was an integral part of the marketing and sales team that launched a new proppant company working with many of the largest service companies in Houston. Following this, she worked in Business Development for GoFrac, LLC to establish a hydraulic fracturing presence in the Eagleford, Permian Basin and the Haynesville Shale. Michelle holds a Bachelor of Business Administration in Marketing from the University of Texas of the Permian Basin where she was recognized as the Outstanding Marketing student for her graduating class.