David Wiist

David Wiist Jr., P.E. is a licensed Professional Engineer in Petroleum Engineering with more than 17 years of experience in unconventional and conventional oil and gas development, reserves evaluation, and economic analysis. His professional background spans reservoir engineering, production engineering, corporate strategic planning, and energy transition project evaluation. He currently serves as a Senior Reservoir Engineering consultant and expert witness, providing technical and economic analysis to operators, investors, and legal counsel. Mr. Wiist’s technical expertise includes decline-curve analysis, type-curve development, reserves estimation, rate-transient analysis, material balance, field development planning, and probabilistic risk and uncertainty analysis. His economic experience includes asset valuation, investment decision analysis, acquisition and divestiture support, and damages evaluation. His work has involved SEC reserves, profit & loss reviews, and portfolio management across multiple basins, with a particular focus on the Oklahoma SCOOP/STACK, Marcellus, Utica, and Mid-Continent plays. Since 2024, Mr. Wiist has served as a Senior Reservoir Engineer and consultant with Tres Management in Oklahoma City. His consulting practice includes reserves and valuation work for SCOOP/STACK operators, acquisition and divestiture evaluations, and expert witness services in oil and gas litigation. His expert work includes evaluation of economic value, reserves, and damages related to unconventional assets, as well as regulatory matters involving testimony before the Oklahoma Corporation Commission. Prior to consulting, Mr. Wiist spent over 16 years with Chesapeake Energy in progressively senior technical and leadership roles. Most recently, he served as Senior Staff Reservoir Engineer in New Energy Ventures, where he led engineering and economic evaluations of geothermal and carbon capture and storage (CCUS) projects, supporting investment decisions for a dedicated energy-transition portfolio. He evaluated more than 40 opportunities and supported capital deployment with projected enterprise-value creation exceeding $100 million. Previously, Mr. Wiist was Senior Staff Reservoir Engineer for Chesapeake’s Marcellus asset, where he led field development planning, reserves management, and acquisition evaluations, including technical characterization and valuation of a multi-billion-dollar acquisition. He also served in Corporate Strategic Planning as the reservoir-engineering liaison for corporate development, supporting capital allocation decisions across multiple assets and contributing to enterprise-level portfolio planning and performance analysis. Mr. Wiist held leadership roles as Reservoir Engineering Supervisor in Appalachia, managing teams responsible for forecasting, reserves, and type-curve development across large Marcellus and Utica positions. Earlier in his career, he served as Staff Reservoir Engineer in the Utica Shale and as a Staff Production Engineer in the Mississippian Lime, where he led production optimization, artificial-lift strategies, and cost-reduction initiatives for large producing asset bases.

I begin each engagement by working closely with retaining counsel to understand the factual background, legal issues, and technical questions presented in the matter. I review relevant case materials, including production data, engineering records, regulatory filings, and commercial documents, to develop an independent technical understanding of the asset and circumstances at issue. As part of this process, I identify missing, incomplete, or inconsistent information and communicate those needs to counsel so that additional data can be requested or clarified. I apply standard petroleum engineering and economic evaluation methodologies to develop preliminary analyses and estimates, which I document in draft reports and supporting work papers. I maintain regular communication with counsel regarding new information, evolving assumptions, and analytical results. My draft opinions are refined through iterative review and feedback, and my final opinions are based on the complete evidentiary record available, industry-accepted practices, and my professional engineering judgment. My approach emphasizes transparency, reproducibility of results, and consistency with accepted professional standards.

Provided 12 expert witness reports in fracture interference litigation estimating reserve and value damage due to lost production. Provided some Oklahoma Corporation Commission technical testimony for regulatory matters.

BS Chemical Engineering, Oklahoma State University, 2007

Licensed Professional Engineer in Petroleum Engineering