We Buy Mineral Rights


Mark is the Founder and President of Arkoma Companies. He founded the first Arkoma entity in 1983.
Meet the team

Mark S. Kelldorf

Founder and President
Mark is the Founder and President of Arkoma Companies. He founded the first Arkoma entity in 1983. His career as a geologist spans over 40 years and continues to include the technical evaluation and acquisition of oil and gas assets in selective plays across the Continental United States. Mr. Kelldorf holds a Bachelor of Science in Geology from the University of Texas – Arlington, followed by graduate studies in Petroleum Geology from Southern Methodist University.
In addition to being a successful entrepreneur and scientist, Mr. Kelldorf has led two weekly Bible Studies for High School students and professionals, respectively, for over 20 years in Rockwall, Texas.

Francisco Alvarez

Managing Director

As Managing Director of Arkoma, Francisco is responsible for leading teams involved in all facets of the investment cycle. This includes origination, initial reviews, structuring investment strategies and due diligence.

Francisco is a trilingual professional with over 10 years of experience in investments, operations and international business development. After a period at Southern Methodist University, Francisco received his Bachelor of Science in Finance from University of Illinois –Chicago and an MBA. He was also a member of the nationally ranked NCAA Division I soccer teams.

Jean Voltz

Project Facilitator

As Project Facilitator of Arkoma, Jean brings over 18 years of invaluable experience to the group of companies. Her main responsibilities include North Dakota production acquisitions, revenue audits, and liquidation facilitation. Jean has over 40 years of experience in finance, through banking and real estate. Prior to joining Arkoma, Jean regulated commercial real estate acquisition developments from the lending side of the banking industry.

Michael Kelldorf

Senior Geologist

Michael is a geologist with over 37 years of experience in research and technical evaluation. He has been with Arkoma since 1983 and continues to be an outstanding asset to the portfolio companies. He is responsible for the initial evaluation of oil and gas assets targeted for acquisition. Michael earned a Bachelor of Science in Geosciences from The University of Texas at Dallas, followed by graduate and post-graduate studies. His graduate studies at the University of Texas at Dallas were completed under the supervision of Dr. Emile Pessano an involved the disciplines of Stratigraphy, Micropaleontology and Structural Geology. These disciplines were utilized in his field studies of jurassic terranes in central Mexico.

Malaga Fivash

Accounting Manager

Malaga has been efficiently handling account management and financial reporting for Arkoma since 2007. She is directly responsible for overseeing all accounting functions for Arkoma's entities and reporting directly to the President.

Trey Hearne

Senior Landman

Trey has worked at Arkoma for almost 6 years and has been in the Oil and Gas Industry for over 9 years. He works in Arkoma's land department and performs many duties including: mineral and lease acquisitions, title due diligence, and assists in the management of Arkoma's assets. He has a Bachelors of Business Administration from Texas A&M - Corpus Christi and is a member of the AAPL.

Kay-Lee Ogle

Senior Landman

Kay-Lee has worked at Arkoma for over 15 years, and has spent the last few years in Arkoma's land department where she deals with everything related to mineral acquisitions and leases for Arkoma. She earned an associates degree in Culinary Arts at Le Cardon Bleu in Dallas and a Bachelor of Arts in Psychology from Southern Methodist University, and is a member of the AAPL.

Jason Steed

Business Development Manager

Jason brings over 8 years of experience in the Oil and Gas industry. After studying Economics at Baylor University, he earned a Bachelor's Degree from A&M University - Commerce in Agricultural Economics. Prior to joining the Arkoma team, he worked as a Business Development/Project Manager at Jericho Partners, a land service company that conducted business throughout the Marcellus and Utica formations.

Niki Ostrom

Land Administrator

Niki is the newest addition the Arkoma team. Niki graduated from Oklahoma State University in May 2017, earning a Bachelors degree in Health Promotions while playing Division I soccer. Niki serves as the Land Administrator. She also assists the land team in data research and management.

Gabrielle Mosley

Executive Assistant to the President

Gabrielle is extremely versatile and is able to quickly address prioritized tasks assigned by the staff. Her responsibilities include welcoming clients to our office, answering phones, filing, research, time sensitive projects, presentation binders, technology issues, as well as, a vast array of other tasks and functions. Over 10years ago, Gabrielle joined the team as a receptionist, her managerial and communication skills allowed her to become a skilled office manager and proactive mineral buyer.

Katy Jo Dewald

Senior Landman

Katy Jo has worked at Arkoma for 2 years and has been in the Oil and Gas Industry for over 16 years. As Project Manager, she is an essential role in monitoring, controlling and closing acquisitions throughout the various companies. Communication, organization, prioritizing, adaptability and reporting are key skills that Katy Jo brings to the success at Arkoma. She is a Registered Professional Landman through AAPL and has a Bachelor of Science Degree in Biology from Northwestern Oklahoma State University.

Andrea Alvarez

Drafting Director

Andrea joined the team in 2014 as a Drafstwoman, but quickly also became a Project Manager due to her leadership, excellent communication, and management skills. She became the Drafting Director in 2020.

Brandon Jenkins

Systems/Outreach Coordinator

Brandon started attending Arkoma Bible Studies in the year 2012. At the end of 2019, he transitioned into the role of outreach coordinator. He is responsible for identifying new partnerships, leading Bible Studies, equipping team members to carry out ministry, working with local businesses and churches to serve local school districts.

Brandon brings a passion for souls and a love for people to the Arkoma Team. He is currently training and attending Christ For The Nations Institute in Dallas, Texas.  Prior to joining the Arkoma team, he attended Northwestern Michigan College, worked as a concert promoter, served as Director of the Boys & Girls in Royse City, and served in multiple ministry roles.