About Us

Medallion Midstream is owned and operated by midstream experts.  Medallion’s managing partners have a combined 100 years of experience serving the producing community.

Our team has a track record of maximizing value for our customers by bringing a wealth of hands-on management, engineering, operations and front and back office understanding to every project.

our commitment

Our comprehensive, integrated solutions go beyond the traditional midstream business model, improving our customer’s visibility and control of product value from wellhead to market.


Listen/our approach

We listen to our customers’ needs.  Understanding your requirements is the key to providing valuable solutions.

Creativity/our approach

Through knowledge and creativity, Medallion develops efficient ways to bring your product to market.

Flexibility/our approach

Medallion offers flexible options.  We provide diverse solutions that best fit your objectives.

Integrity/our approach

We stand by our work and keep our promises.  When challenges occur, we work with you to find the best short-term and long-term solutions.


President and CEO

President and CEO

Medallion Midstream’s founder has 31 years of experience in the natural gas midstream business in a variety of operational and commercial leadership roles.

From March 2005 until May 2010, Mr. Lentz served as Senior Vice President and Vice President, Commercial Operations with Penn Virginia Resource Partners, where he had direct responsibility for the midstream division’s day-to-day business operations including business development, gas supply, contract administration, and natural gas and NGL marketing. During his five years with Penn Virginia, Mr. Lentz managed all commercial activities related to the company’s midstream assets comprising more than 4,000 miles of gas gathering pipelines, 400 million standard cubic feet per day (“MMCFD”) of natural gas processing capacity and related natural gas liquids pipelines, including the construction and acquisition of more than 600 miles of gas gathering pipelines and 240 MMCFD of natural gas processing capacity.

Prior to his employment with Penn Virginia, Mr. Lentz was a partner and Vice President, Business Development with Cantera Resources and Cantera Natural Gas. During his five years at Cantera, the company acquired over $240 million in gas gathering and processing assets. Mr. Lentz contributed to the strategy, development, relationship building, capacity and throughput increases, and cost reductions that collectively led to the sale of the same assets for more than $1.4 billion.

Prior to Cantera, Mr. Lentz served in various management roles with Union Pacific Fuels, Highlands Gas Corporation and Cimarron Gathering and Processing Company.



Mr. Doll brings 29 years of energy industry experience and strong financial and accounting leadership to Medallion.

From September 2007 until joining Medallion, Mr. Doll served as Vice President, Finance with Laser Midstream Energy, LP, where he was responsible for overseeing all of Laser’s financial activities including accounting, finance, credit, risk management, analysis, and administration. While at Laser, Mr. Doll successfully arranged a $105 million senior secured credit facility and was instrumental in the negotiations and development of a $150 million pipeline project in the Marcellus Shale.

Prior to joining Laser, Mr. Doll held the title of Western Hemisphere Controller for Hanover Compressor Company, where he was responsible for oversight of world-wide manufacturing accounting as well as finance and accounting activities for the North and South American compressor rental division.

Before joining Hanover Compressor Company, Mr. Doll held a variety of financial, accounting, business development, and management roles with Hanover Measurement Services, Texas Southeastern Gas Company and Houston Pipeline Company.

VP, Business Development

VP, Business Development

Mr. Amaya has 38 years of experience in the natural gas midstream business and a proven track record for building relationships and creating value.

From August 2008 until March 2011, Mr. Amaya served as Director, Gas Supply with Penn Virginia Resource Partners, where he was responsible for growing the gas supply on the company’s gathering and processing assets and for pursuing and executing projects to expand the asset base through acquisition and greenfield projects. During his two years at Penn Virginia, Mr. Amaya successfully negotiated multiple long-term contracts that facilitated the expansion of Penn Virginia’s assets in the Mid-Continent, East Texas, and North Texas.

Prior to his employment with Penn Virginia, Mr. Amaya was Manager, System Development for Enogex, Inc. While at Enogex, Mr. Amaya leveraged key relationships to successfully develop expansion projects exceeding $50 million and generating gas volumes of over 300 MMCFD.

Prior to Enogex, Mr. Amaya served four years as Gas Marketing Manager for Devon Energy’s offshore and deepwater production, and 23 years in various management roles with GPM/Phillips Gas and Gas Liquids.

VP, Operations

VP, Operations

Mr. Lewis has over 32 years of experience in multiple midstream roles including leadership positions in operations, engineering, compliance and management.

From 2008 until joining Medallion, Mr. Lewis served as Director of Operations for Kahuna Ventures, a full service engineering, construction and operations company based in Westminster, Colorado. While at Kahuna, Mr. Lewis managed the day to day operations of simultaneous projects including Antero Midstream’s Oklahoma Woodford Shale assets, which consisted of 140 MMCFD of natural gas processing, treating, gas gathering, and natural gas liquids pipelines and equipment and Keystone Midstream’s Pennsylvania System, from design phase to full operations, which included 90 MMCFD of natural gas gathering and processing facilities. Mr. Lewis’ responsibilities at Kahuna Ventures included: design, construction and operations of pipeline systems for produced liquids; managing DOT-regulated liquids and gas pipelines; managing integrated measurement and control systems; designing and installing pump systems, NGL storage facilities, condensate handling, gas gathering and compression; and installing and managing the operations of multiple processing and treating plants.

Prior to Kahuna Ventures Mr. Lewis spent three years as Business Unit Manager for the Compressor System Inc. (“CSI”), $38 million Northern Rockies Business Unit where he was responsible for two full services maintenance facilities, three field operations facilities, five operating areas, an 110,000 horsepower compression fleet, maintenance contracts covering 115,000 horsepower of customer owned compression and general oversight of 62 employees.

Prior to CSI, Mr. Lewis spent nine years as Manager of Operations, Engineering and Technical Support for Production Operators, Inc. and seven years in various operations, management and supervisory roles with Western Gas Resources.


EMG is the management company for a series of specialized private equity funds. The Firm was founded by John Raymond (majority owner and CEO) and John Calvert in 2006. EMG focuses on investing across various facets of the global natural resource industry including the upstream and midstream segments of the energy complex. EMG has approximately $16.5 billion of regulatory assets under management and approximately $9.4 billion in commitments have been allocated across the energy sector since inception.