Carbon Management Forum Speakers

  • Gabriel Rio, Milestone Environmental Services, ESG Speaker

    Gabriel Rio

    Milestone Environmental Services
    President & CEO

    Gabriel has more than 15 years of experience in the oil and gas environmental services industry. He is currently the President & CEO of Milestone Environmental Services, LLC. 

    Prior to leading Milestone, Gabriel worked as an Operating Partner with Intervale Capital, now known as Amberjack Capital, an oilfield-focused private equity fund with $1.2 billion in assets under management, and a key investor in Milestone. He was previously the Executive Vice President of Strategy and Business Development for R360 Environmental Solutions, Inc., a national provider of environmental services to the E&P industry. At R360, Gabriel orchestrated the strategy and mergers and acquisitions work which led to the formation and rapid growth of the company, and directly managed Williston Basin operations. After R360 completed a $1.3 billion sale to Waste Connections, Inc., Gabriel assumed work with the buyer to help with the integration of the R360 business into Waste Connections. Prior to R360's formation in 2010, he was an investment professional with Three Cities Research, Inc., a mid-market private equity firm, where he was principally responsible for US Liquids of LA, LP, a regional oilfield waste treatment and disposal provider in Louisiana and Texas. 

    Earlier in his career, Gabriel worked as an Associate Equity Research Analyst covering the global chemical industry at UBS Investment Bank, as a Petroleum Practice Fellow with McKinsey & Company, a global strategy consultancy, and as an Associate at Purvin & Gertz, a Houston-based oil and gas consultancy. Gabriel holds a Bachelor’s degree in Chemical Engineering from the University of Texas at Austin.


  • Hart Energy Conferences Speaker Greg Davis

    Greg Davis

    EIV Capital

    Greg Davis serves as a Partner of EIV and a member of the firm’s Investment Committee. He is actively involved in the firm’s strategy and is responsible for originating and stewarding investments across EIV’s areas of focus. Greg has 14 years of energy finance and investment experience including the upstream and midstream sectors. Greg most recently served as Investment Committee member and Managing Director at Kayne Anderson Energy Funds, where he contributed in all aspects of the business’ investment activities including portfolio company board participation and monitoring, investment sourcing and due diligence, and transaction structuring and execution. Prior to his 11-plus years at Kayne Anderson Energy Funds, Greg started his career at Credit Suisse’s investment banking Natural Resources Group, where he worked with current EIV Partner, David Finan. At Credit Suisse, Greg focused on mergers, acquisitions and capital market transactions.

    Greg holds a Bachelor of Business Administration in Finance from The University of Texas at Austin, graduating summa cum laude. Greg is actively involved in the Houston community, currently serving on the boards of Small Steps Nurturing Center and The Texas Hearing Institute.


  • Hart Energy Conferences Speaker John Guoynes

    John Guoynes

    E3 Energy Services
    Vice President, Business Development

    John Guoynes is Vice President of Business Development for E3 Energy Services, a solution- based compression and midstream service provider. John has over 35 years of experience in oil and gas engineering and operations including: President of Big North Consulting, Director of Production and Operations at Rice Energy and Engineering Manager for CNX Gas. He has a broad expertise in both upstream and midstream sectors of unconventional and conventional assets including production optimization, reservoir management, gas storage and enhanced oil recovery. He is  currently involved with a variety of ventures for oil, natural gas and NGL’s including practical solutions for decarbonization.

    He is a graduate Petroleum Engineer from Oklahoma State University with an MBA and has authored numerous publications and served on several Oil and Gas committees including an appointment to a State Oil and Gas Regulatory Board.

  • Hart Energy Conferences Speaker Jon Rogers

    Jonathan Rogers

    Locus Bio-Energy Solutions

    Jon is the CEO of Locus Bio-Energy Solutions and an experienced industry presenter that advocates for developing disruptive green technology to maximize sustainability and profitability of oilfield operations. He has more than 30 years of experience as a seasoned oil executive, previously holding leadership positions including global head of BL Oil Services at Clariant, Global Technology Director at BP, EVP at Champion Technologies and MD at Sasol Oilfield Chemicals. Jon is originally from the United Kingdom and a Fellow of the Royal Society of Chemistry. He has a BA in chemistry from the University of Liverpool, an MBA from the University of Durham and is a holder of four patents.


  • Hart Energy Conferences Speaker Rachel Schelble

    Rachel Schelble

    Wood Mackenzie
    Research Director Corporate Research

    With over 15 years of experience working in the oil and gas industry, Rachel Schelble recently joined Wood Mackenzie as a Director in Corporate Research with a focus on Midstream Infrastructure, Carbon Management, and Energy Transition Strategies.

    Prior to joining Wood Mackenzie, Rachel worked for ExxonMobil where she held multiple positions in competitor analysis, commercial negotiation, value chain integration, infrastructure development, geoscience integration, and resource evaluation in roles based in Russia, Canada, and the U.S. Most recently, she led a project focused on understanding the potential of nature based solutions for carbon sequestration, and development of carbon management strategy profiles for U.S. oil and gas companies.

    Prior to this, Rachel was located in Midland, TX and worked as part of XTO Energy (a subsidiary of ExxonMobil), focused on developing the Permian Basin, leading commercial infrastructure and marketing negotiations and working to align business objectives across the Permian Value Chain from Upstream through to Chemicals.

    Rachel has a PhD in Earth Sciences from the University of Southern California, and a BSc in Earth and Planetary Sciences from the University of New Mexico.

  • Hart Energy Conferences Speaker Regina Mayor

    Regina Mayor

    Principal, Global Sector Head and U.S. National Sector Leader of Energy and Natural Resources

    Regina Mayor serves as KPMG’s Global Head of Energy and Natural Resources. She is a recognized thought leader on the disruptive trends facing the various segments of the energy value chain – from the impact of millennial and baby boomers on gasoline consumption to the rapidly changing demands in the power generation segment. Regina brings nearly 30 years of experience delivering largescale business and technology changes to major energy companies around the world.

    Regina is an expert on energy trends and oil prices, frequently appearing on major TV news networks like Bloomberg, CNBC and Fox Business, and in top-tier business press including Reuters, Forbes, and The Wall Street Journal.

    She is also a strong voice for women and inclusion and has been recognized for her advocacy. In 2020, she was named a “Global Leader of Influence” by the World Affairs Council. In 2018, she was inducted into the Greater Houston Women’s Hall of Fame and named by Oil & Gas Investor as one of the 25 most influential women in Energy. In 2016 she was named one of Houston’s 50 Most Influential Women. She has been recognized by the Houston Business Journal as a "Who’s Who in Energy" every year since 2014 and “Women Who Mean Business” in 2017. She was also featured in cover stories in both SHALE magazine and Oil & Gas Financial Journal in July 2016.

    Regina is the host of KPMG’s annual Global Energy Conference and is a sought-after speaker and participant for major industry forums such as Privcap’s Energy Game Change, Gastech, Platt's LNG Conference, the World Energy Conference, Women’s Energy Network events, among others. She attended the World Economic Forum in Davos as a delegate representing KPMG, participating in key sessions that support the meeting’s annual agenda.

    Regina served as an adjunct professor at Rice University’s Jones School of Business teaching energy strategy to professional MBA candidates and spoke at the Rice Energy Finance Summit in 2019. She also serves on the boards of the Cornell Energy Institute and the Petroleum Club of Houston.

    She holds a Bachelor of Science degree from Cornell University and a Master of Public Policy from Harvard University. She was an officer in the U.S. Army Reserve and interned at the Pentagon as part of the Supreme Headquarters Allied Powers Europe (SHAPE) liaison office. Regina was born and raised in Pearl City, Hawaii, and currently resides in Houston, TX.

  • Hart Energy Conferences speaker Toben Scott

    Toben Scott

    Return Disposal

    Toben Scott was born in Comanche, Texas, on a family peanut farm. He has a wife, Misty, and three school aged children. The Scott Family has lived in Midland, Texas, since 2001.

    Toben Scott graduated with a BS in Petroleum Engineering from Texas Tech University in May of 2000. Toben began his career with Phillips Petroleum in Houston, Texas, and was shortly transferred to the Permian Basin for a Drilling Engineer position. Toben gained additional industry experience in production, completions, and operations with Permian independent oil & gas company notables Walsh Petroleum, Fasken Oil & Ranch, and Tandem Energy. Toben launched out on his own in 2005 and founded AggieTechOil, Ltd. with a partner and a desire to grow his own oil & gas company. AggieTech simultaneously founded Sweetwater Water Transfer Service that grew to 200 employees, $1MM/month in EBITDA,  & four regional offices in eight total shale plays across the U.S. Sweetwater sold to Select Energy Services (NYSE: WTTR) in 2010. Toben then founded AggieTechSWD, LLC in 2012 that sold to Oilfield Water Logistics (backed by NGP) in 2014. Toben most recently founded Return Disposal in December of 2017 and, in 12 short months, had already developed two assets in the Midland Basin portion of the Permian Basin

  • Hart Energy Conferences Speaker William Barrett

    William Barrett

    Oxy Low Carbon Ventures
    Commercial Director

    William Barrett is a Commercial Director in Oxy Low Carbon Ventures, LLC, a subsidiary of Occidental (Oxy). He received a Bachelor of Science degree in Petroleum Engineering from Texas A&M University with magna cum laude honors in 1988, and an MBA with concentration in International Business from the University of St. Thomas. William is a registered professional engineer in the State of Texas and serves on the University of Houston’s Petroleum Engineering Advisory Board.

    Achievements in his 33 years of industry experience include setting records drilling short radius horizontal wells, managing assets and technical personnel working oil and gas fields in the Mid-Continent states of the U.S., managing activities of the largest CO2 flooding operation in the world as the CO2 Project Manager of Oxy’s Permian Basin Division, managing a team to bring EOR technologies to California oil fields, and adding value to international assets working as a Vice President of Occidental de Colombia. Mr. Barrett has been involved in all aspects of the CO2 business including CO2 supply and distribution, the design and implementation of greenfield and brownfield CO2 EOR projects, and carbon capture, utilization and storage. In his current role as Commercial Director in Oxy Low Carbon Ventures, William is involved with efforts to advance leading-edge, low-carbon technologies and business solutions.