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< Back Rick Robinson VP of Reservoir Rick Robinson serves as Vice President of Reservoir Engineering for Ensign Natural Resources. Mr. Robinson has more than 20 years of expertise in reserves evaluation and economic modeling throughout all major US conventional and unconventional plays. He brings extensive technical and strategic strengths to the Ensign team where he manages reserves, reservoir, and economic modeling and forecasting and supports business development, field development planning, operations, field surveillance, and production forecasting and optimization. Prior to Ensign, Mr. Robinson spent 15 years with Ryder Scott where he served as Managing Senior Vice President. Prior to Ryder Scott, he was with ExxonMobil where he was responsible for well surveillance and field development as a Reservoir Engineer. He received his bachelor’s degree in Chemical Engineering from Brigham Young University, he is an active member of SPE, and is a Licensed Professional Engineer in the State of Texas. Previous Next

Who we are Ensign Natural Resources is an exploration & production company expanding through asset acquisitions and development. We believe in making disciplined investments, applying effective technology, and focusing on continuous improvement. Headquartered in Houston, TX, Ensign was established in 2017 and is led by a management team experienced in finding, developing, and exploiting unconventional assets. About Us Who we are How we're different Our People & Culture Leadership Team Board of Directors Sponsor noun | en·sign | ‘en-.sīn en′sīn, n. a sign or mark: the sign or flag distinguishing a nation or a regiment: one who carries the colors. Why Ensign? ​ Throughout history, ensigns have been used to send messages, rally beleaguered troops, signal other ships, armies, and peoples. Ensigns represent a group’s courage, pride, and identity. In short, an ensign says who you are, where you are, and what you believe with one single piece of cloth or mark. We are here to set a new standard. We’re courageous enough to take on the hard challenges and proud to drive change in our industry. This is what being Ensign means to us. Rally with us! How we're Different At Ensign, data and technology are a large part of how we drive success. ​ Not only do we have a development team who is knowledgeable about our industry, operations, and data but we expect all our technical team members to be proficient in data management tools and processes. This ensures everyone can create fit-for-purpose data capture apps and visualizations that allow for faster and better decision-making with no silos in data access and continual prioritization of economic impact to the company. ​ Our People & Culture Our people define our culture and drive the strategy of our company. We look for team members that embody our values and strive to make us better every single day. ​ Meet some of our team! My favorite thing about working at Ensign, beyond the amazing culture, is working with such brilliant people in each department. Being able to learn from people who are passionate about their work is fun to be around. Jeremy Reeves Learn More Director, Information Technology Jeremy Reeves // Director, Information Technology My favorite thing about working for Ensign is the culture. It isn’t draining nor is it unpleasant, but it fosters that genuine feeling of “you are important here, we need you”. Most companies make employees feel that they not needed nor valued. That is the total opposite here at Ensign. LaShonda McClain Learn More Executive Assistant Jeremy Reeves // Director, Information Technology The ability and encouragement to get involved regardless of your area of expertise or experience. I think this makes all of us better and multi skilled over time as well as provides those with more experience a different angle to view issues. Roel Garcia Learn More Production Supervisor Jeremy Reeves // Director, Information Technology Our Values Ownership Taking responsibility for actions and problems; leading solutions; never miss a chance to lead. Courage Stand up for your ideas; open communication; give and take honest feedback. Grit A mixture of passion and determination; willing to face the hard stuff and see it through to the end. Good Judgement A practiced eye for good opportunities; prioritizing based on value to company vs. self; making informed decisions and calculated risks. Continuous Improvement Good enough never is! Make things better every day; complacency is the enemy. Leadership Team Brett Pennington President and Chief Executive Officer "We believe in alignment at all levels of the organization. Delivering results is easy when everyone is aware of our goals and strategy, and are empowered to make a difference." View More EVP & CFO Mark Lumpkin View More EVP of Subsurface & Business Development Jon Baker View More EVP of HR, IT, & Administration Candace Day-Butler View More VP of Midstream, Surface, & Projects Sean Bradley View More VP of Reservoir Rick Robinson View More VP of Drilling & Completions Rhett Bullock View More VP of Finance Connor Mannon View More Senior Manager of Land Sean McLaughlin View More Board of Directors Chris Carter View More Patrick McWilliams View More Peter Ray View More Sponsor NGP has been a pioneer of the North American energy industry for over 35 years—always keeping an innovative eye on the future. At their core, they are energy investors and business builders. NGP investments have fostered entrepreneurship, driven innovation, created jobs, advanced U.S. energy security, and supported the critical missions of their stakeholders. Today, they are one of the most trusted private equity energy investors. Learn more about NGP at https://ngpenergy.com/ .

SETTING THE NEW STANDARD FOR UNCONVENTIONALS through Strategy, Culture and Technology Ensign Natural Resources is a private equity backed exploration and production company focused on acquiring, developing, and producing US unconventional resources. Ensign’s founders are committed to creating a durable and long-term focused company generating maximum value for its stakeholders. Energy for a brighter, cleaner future ​ We believe it is our responsibility to steward our environment, ensure the safety of our people, and act responsibly with our investments. Learn More SUSTAINABILITY STRATEGY Value through Simplification By cleaning up corporate structure and obligations of acquired assets, our team was able to improve working interest by 50%, uncover and manage liabilities and improve net GP&T rates across both oil and NGL. Learn More CULTURE Best People Empowered to Drive Performance Delivering excellent results comes from having excellent people that have the freedom and mandate to make things a little better every day. We believe in alignment at all levels of the organization. Delivering results is easy when everyone is aware of our goals and strategy and are empowered to make a difference. Learn More TECHNOLOGY Data-based Decision Making We’re committed to making better decisions with the best data and ensuring transparency of information at all levels. This commitment, coupled with a commitment to transformative technology, allows Ensign to leverage data to make decisions that support our long-term strategy. Learn More

< Back Sean Bradley VP of Midstream, Surface, & Projects Sean Bradley serves as Vice President of Midstream, Surface & projects for Ensign Natural Resources. Mr. Bradley has over 12 years of oil and gas operator experience and prior to industry served for 11 in the Utah Army National Guard, inclusive of two deployments. Prior to joining Ensign, Mr. Bradley served in roles of increasing complexity and responsibility with Murphy Oil where he led projects throughout their US onshore and Gulf of Mexico assets. He is a champion of continuous improvement, automation, and data analytics, which he has shown to consistently improve Ensign’s profitability. Mr. Bradley holds a B.S. degree in Chemical Engineering from Brigham Young University. Previous Next

< Back Sean McLaughlin Senior Manager of Land Sean McLaughlin serves as Senior Manager of Land and Board Secretary for Ensign Natural Resources. Prior to Ensign, Mr. McLaughlin served as Senior Business Development/Corporate Development Landman in the Business Development organization for Callon Petroleum, where he was pivotal in various successful acquisition and divestiture transactions in both the Permian and Eagle Ford. Prior to Callon, he held positions of increasing complexity and responsibility with ConocoPhillips Company. Mr. McLaughlin has been an instrumental leader in Ensign’s acquisition, development, and disposition activities, with tireless focus on effectively managing all land and commercial aspects. Mr. McLaughlin holds a bachelor’s degree in Energy Management with a minor in Finance from the University of Oklahoma. Previous Next

< Back Mark Lumpkin EVP & CFO Mark Lumpkin serves as Executive Vice President and Chief Financial Officer for Ensign Natural Resources. Mr. Lumpkin has over 29 years of experience, including over 20 years of oil and gas finance experience. Prior to joining Ensign, Mr. Lumpkin served as Executive Vice President and Chief Financial Officer of Earthstone Energy, Inc. where he led corporate, M&A, and financial strategies resulting in numerous transformative acquisitions and ultimately the successful sale of Earthstone to Permian Resources in 2023. Prior to Earthstone, he held various roles at The Royal Bank of Scotland and at RBC Capital Markets, most recently as a Managing Director at RBC. Mr. Lumpkin graduated with a B.A. degree in Economics from Louisiana State University and graduated with a Master of Business Administration degree with a Finance concentration from Tulane University. Previous Next

< Back Brett Pennington President and Chief Executive Officer Brett Pennington, President & Chief Executive officer, founded Ensign Natural Resources in December 2017 and created one of the most lucrative private equity transactions in the Eagle Ford that closed in December 2022. Prior to Ensign, he served in technical and leadership roles for Murphy Oil Corporation and ExxonMobil throughout the lower 48 States and Alaska. At Murphy, Mr. Pennington built the Eagle Ford Shale asset through acreage acquisition and leasing starting in 2009 and continuing through early exploration, delineation, and development. With more than twenty-two years of industry experience, Mr. Pennington has worked almost every major basin in North America through various roles including Reservoir Engineering, Engineering Management, Corporate Planning, Operations and Enterprise Management. Mr. Pennington received a bachelor’s degree in Chemical Engineering from Brigham Young University and completed the Advanced Management Program at Harvard. Previous Next

< Back Roel Garcia Production Supervisor "The ability and encouragement to get involved regardless of your area of expertise or experience makes us all better and multi-skilled over time. If you're intelligent, work hard, and are in constant pursuit of growth and development it would be hard to find a better place." Tell us about yourself. I Served in the Marine Corps from ‘07 to ’11, Deployed to Afghanistan. I’m Married with 2 little girls. I held the same position (lead operator) at Murphy Oil Corp, and wanted to be part of the team moving to Ensign. How is Ensign different from other places you have worked? Day to day business moves much faster. For example, If something needs to get done we can get approval in minutes rather than hours or days. What is your favorite thing about working at Ensign? The ability and encouragement to get involved regardless of your area of expertise or experience. I think this makes all of us better and multi skilled over time as well as provides those with more experience a different angle to view issues. What would you say to someone who was interested in working at Ensign? I would say it’s a challenging and rewarding meritocracy. If you’re intelligent, work hard, and are in constant pursuit of growth and development it would be hard to find a better place to show up and feel satisfied every day.

< Back Jon Baker EVP of Subsurface & Business Development Jon Baker serves as Executive Vice President of Subsurface and Business Development for Ensign Natural Resources. Mr. Baker has a 25-year track record of leading teams to create value through technical assessment and asset development. Prior to joining Ensign, Mr. Baker served as Senior Vice President, Geoscience & Engineering for Rio Oil & Gas where he led multiple iterations of the company through acquisition, development, and disposition activities. Prior to Rio, he held technical and leadership roles at multiple successful private equity companies. Mr. Baker holds a bachelor’s degree in Geological Engineering from Brigham Young University with a master’s degree in Geology from the University of Houston. Previous Next

Contact Contact our Team Have a question? Our team is here to help. General Inquiries Contact Us Owner Inquiries Contact Us General Inquiries info@ensignnr.com ​ ​ ​ Mailing Address Ensign Natural Resources LLC 5875 North Sam Houston Pkwy W. Suite 600 Houston, TX 77086 ​ ​

Ensign Transition to Marathon On 10/1/2022, Marathon Oil EF II acquired all Eagle Ford wells previously operated by Ensign. Beginning April 25, 2023 all revenue payments will be remitted by Marathon Oil. All inquiries and notifications should now be directed to Marathon Oil Company Owner Relations. ​ Phone: 888-522-8871 Email: ownerrelations@marathonoil.com Marathon Oil Company Division Order P.O. Box 2069 Houston, TX 77252-9755 Marathon Owner Relations