The 2025 SPEE Board Election has concluded, and the results are in! The membership has elected three new Board Members who will take their seats in January 2026 for a three-year term, concluding in December 2028. The new Board Members elected are:
- Lindsey Stelmach
- Connor Riseden
- John Hornbrook
We wish to thank the SPEE Members who ran for election. SPEE Board members represent the Society as a whole, generating, defining, executing, and supporting various initiatives that drive the growth and progression of the Society. It is the active participation of the membership that continues to make this society highly respected across the industry. We are grateful for the participation of those who took the time to vote.
Thank you,
Dean Sergent, 2025 Past President & Nominating Committee Chair
Position 1
Lindsey Stelmach
Lindsey has been an active member of the Denver Chapter since 2021 and joined the board in 2024, initially serving as Membership Chair and currently holding the position of Treasurer. Her involvement includes organizing luncheons, leading new membership outreach initiatives, and coordinating Summer Soirees for members and industry professionals. Lindsey successfully hosted the inaugural Monograph 5 training session in Denver, volunteered at the 2024 Software Symposium, and is a committee member for the 2026 Software Symposium. She has attended the last two annual conferences and looks forward to the upcoming event in Utah. Lindsey is dedicated to Reserves and actively encourages younger generations to participate in economic evaluation, Reserve reporting, and to join SPEE. She believes SPEE is an exceptional organization and her involvement with the group has been extremely rewarding on multiple levels. She hopes to serve SPEE at the International level and continue the excellent work that so many before her have volunteered their time to foster and grow.
Currently, Lindsey serves as a Reservoir Engineer at OXY in Denver, collaborating with the Powder River Basin WY team on development planning and project evaluation. She began her career in 2003 with Kerr McGee as a file clerk and advanced to the role of Engineering Analyst in the Rockies Reserves group in 2005. This experience ignited her passion for Reserves, motivating her to pursue further education in Petroleum Engineering. Lindsey has held various roles related to data management, economic evaluations, planning, Reserves, and Reservoir Engineering at Anadarko and OXY. She is recognized within her organization for her extensive expertise in Reserve reporting, DCA forecasting, type well profile generation, and economic evaluations. She has working experience with the DJ Basin, Powder River Basin, and Permian Basin. From 2016 to 2018, she served as Corporate Reserves Administration Manager at Anadarko gaining exposure and experience to International and Gulf of Mexico Reserves and Resources. Lindsey holds a B.S. in Mathematics (2004) and an M.S. in Statistics (2007) from the University of Northern Colorado, as well as a B.S. in Petroleum Engineering (2014) from the University of North Dakota.
In her leisure time, Lindsey enjoys walking her German Shepherds, gardening and landscaping, working on home improvement projects, volunteering in the community, fishing, traveling, and spending time with friends and family.
Position 2
Connor Riseden
Connor has been an active member of SPEE since joining in 2020, and he currently serves as Treasurer in the Houston Chapter. As a second-generation SPEE member and petroleum engineer, Connor’s work and involvement reflects a commitment to supporting SPEE and the profession of Petroleum Evaluation Engineering.
Connor joined Netherland, Sewell & Associates, Inc. in 2006, and he is currently a Vice President and Team Leader where he prepares and oversees independent reserve evaluations for clients. Netherland, Sewell & Associates, Inc. (NSAI) is a worldwide leader of petroleum property analysis for industry, financial organizations, and government agencies. During his nineteen-year career at NSAI, Connor has been heavily focused on unconventional resource evaluations in the United States. Starting with evaluating early development in Barnett and Fayetteville Shales that kicked off the unconventional revolution, Connor has gained significant experience with the application of reserve definitions and methodologies that are continuously evolving in unconventionals. Additionally, Connor has also evaluated many conventional developments in the lower 48 that include many unique developments such as a fire flood EOR project in northern Louisiana and a tertiary flood in Florida. Recently, Connor has served as an expert in litigation cases providing expert analysis and testimony.
Prior to working at NSAI, Connor started his career in 2001 working with ExxonMobil in New Orleans. During his time with ExxonMobil, Connor worked as a reservoir engineer for the ExxonMobil operated Mobile Bay Field and other Gulf of America fields. He performed reservoir engineering and economic analysis of drilling programs, well optimizations, and workover programs. As the lead reservoir engineer for Mobile Bay Field, he also evaluated and implemented a field-wide compression project.
Connor received a Bachelor of Science Degree in Petroleum Engineering from Texas A&M University in 2001 and a Master’s Degree in Business Administration from Tulane University in 2005. Connor is a registered professional engineer in Texas and a member of SPE since 2003. As an Eagle Scout, Connor volunteers his time as an Assistant Scoutmaster with a local Scouting America Troop, and he has served on the board of St. Charles Bay Hunting Club since 2021. Connor lives in Houston with his wife of twenty years and two teenage children.
Position 3
John Hornbrook
John Hornbrook received a B.S. degree with honors in petroleum engineering from the University of Tulsa in 1986. From Stanford University he earned an M.S. degree in 1991 and a Ph.D. degree in 1994 in petroleum engineering with a Ph.D. Minor in civil engineering. He received numerous educational honors and has contributed technical articles to industry journals and educational publications.
From 1994 to 1997, Dr. Hornbrook worked as a reservoir engineer for BP Alaska, where he focused on development of the Prudhoe Bay reservoir. He assisted with annual Reserves evaluations and performed modeling support for ongoing Reserves assessments. From 1997 to 2002, Dr. Hornbrook worked for Cawley, Gillespie, and Associates as an engineer on a variety of domestic and international projects. He performed Reserves evaluations and provided modeling support for Reserves evaluations on a variety of projects including conventional oil, gas, and heavy oil projects.
From 2002 through 2022, Dr. Hornbrook worked for DeGolyer and MacNaughton in various roles including Vice President (2004), Senior Vice President (2010), and Executive Vice President (2021). He provided engineering and management for projects around the world and gained in global venues including U.S. onshore, the shelf, and deepwater Gulf of Mexico; South America, the Midde East, Europe, Western and Eastern Siberia, Australia, Asia, and West Africa, and North Africa. Hornbrook’s experience includes field development studies, probabilistic analysis, Reserves and Resources estimation, property valuation, well test design and analysis, gas storage assessment, and analysis of improved oil recovery mechanisms. He is experienced in oil and gas, heavy oil, geothermal, and coal bed methane applications. He also developed and constructed a proprietary quick-look simulation-based model used in development and Reserves evaluations.
In 2023, Dr. Hornbrook founded Stratum Solutions, LLC, an independent petroleum consulting firm with a focus on field development optimization and Resources evaluations. Hornbrook also became Executive Director – Development and Engineering for Alpha Energy, a petroleum development company with a focus on field development rehabilitation and optimization.
In addition to the experience summarized above, Dr. Hornbrook has served as an expert witness on multiple significant arbitrations involving disputes on field development planning, Resources evaluations, and asset valuation. Dr. Hornbrook has written extensively and testified on a wide variety of related topics including, among others, development evaluation procedures, modeling techniques, PRMS and SEC Reserves evaluation and reporting procedures, development decision-making, and the estimation of fair market value.
Dr. Hornbrook is a member of the Society of Petroleum Engineers, the Society of Petroleum Evaluation Engineers, and the Association of International Petroleum Negotiators, and has served as technical editor for the “SPE Reservoir Evaluation & Engineering” magazine. Dr. Hornbrook is a registered professional engineer in the state of Texas.
