Leadership

Leadership Team

"*" indicates members of both the Executive Committee and the Board of Directors

A man in suit and tie smiling for the camera.

Guale

Ramirez, P.E.*

Chairman & Chief Executive Officer

Guadalupe "Guale" Ramirez, P.E., has over 40 years of experience in petroleum engineering and serves as Chairman and CEO of Ryder Scott Company. He earned a bachelor’s degree in Mechanical Engineering from Texas A&M University in 1976 and has completed advanced training in reservoir engineering, well log evaluation, waterflooding, and other specialized areas. This robust foundation has been instrumental in his career progression and technical expertise.

Joining Ryder Scott in 1981 as a reservoir engineer, Guale advanced through key roles, including President, Vice President, and Managing Senior Vice President. He has led over 50 international projects focused on reserves certifications, economic evaluations, and thermal recovery studies. Fluent in English and Spanish, Guale is a licensed Professional Engineer in Texas and a trusted expert in SEC and SPE-PRMS reserves definitions. His leadership has driven Ryder Scott’s growth into midstream consulting and sustainability studies, ensuring its position as an industry leader.

Herman G.

Acuña, P.E.*

President

Herman G. Acuña, P.E., serves as President of Ryder Scott, bringing over 30 years of experience in petroleum engineering and project management. He holds both a Master’s (1989) and a Bachelor’s (1987) degree in Petroleum Engineering from the University of Tulsa, with additional training through Exxon-sponsored industry seminars. His technical expertise includes reserves evaluations, integrated reservoir studies, and advanced simulation techniques.

Herman has led high-profile projects in the Middle East, South America, and Central Asia, guiding major clients like ADNOC and ECOPETROL through complex evaluations. Fluent in English, Spanish, and German, Herman is a licensed Professional Engineer in Texas and an active member of SPE and AIPN. Since joining Ryder Scott in 1997, he has played a pivotal role in the company’s growth, with contributions to training, litigation support, and Carbon Capture and Storage (CCS) initiatives.

A man in a suit and tie smiling for the camera.

Tosin

Famurewa, P.E.*

Executive Vice President

Tosin Famurewa, P.E., is an Executive Vice President at Ryder Scott with over 20 years of production, project controls, reservoir engineering, and management experience in operations, asset-team, joint-venture, and consulting environments of the energy business. He holds dual bachelor’s degrees in chemical engineering and Materials Science/Engineering from the University of California at Berkeley (2000) and a master’s degree in petroleum engineering from the University of Southern California (2007). He currently manages global multi-disciplinary teams evaluating resources for acquisition, divestiture, strategic planning, capital rounds, and regulatory filing purposes.

Tosin’s major clientele includes Chevron, BP, ExxonMobil, ADNOC, ANPG, Sonangol, NNPC, Pemex, Ecopetrol, Seplat, Conoil, Famfa, Shoreline, Green Energy, RSK, Perenco and Kosmos. A previous Chairman of the Society of Petroleum Evaluation Engineers, Houston Chapter, his leadership continues to drive Ryder Scott’s reputation as a leader in global energy consulting.

Eric T.

Nelson, P.E.*

Executive Vice President

Eric T. Nelson, P.E., serves as an Executive Vice President of Engineering at Ryder Scott, with over 20 years of experience in reservoir engineering and consulting. He holds a Bachelor of Science in Chemical Engineering from the University of Tulsa (2002) and a Master of Business Administration from the University of Texas (2007). His expertise spans performance analysis, volumetrics, and material balance techniques for global projects.

Eric has led comprehensive reserves evaluations and audits for clients with assets in the Gulf of Mexico, Brazil, Venezuela, Africa, and offshore Australia. His proficiency in SEC and SPE-PRMS reserves definitions ensures compliance with industry standards. A skilled leader of multi-disciplinary teams, Eric has contributed to high-profile projects, including acquisition and divestiture transactions. He is committed to fostering strong client relationships and advancing operational excellence within Ryder Scott's engineering division.

"*" indicates members of both the Executive Committee and the Board of Directors

Guale Ramirez, P.E.*

Chairman & Chief Executive Officer

Guale Ramirez is part of Executive Committee and Board of Directors. He has been a Petroleum engineer since 1976. Joined Ryder Scott in 1981 as a petroleum engineer. Previously, worked as a petroleum engineer at Natomas North America and Sun Production Co., where he began his career. BS degree in mechanical engineering, Texas A&M University. Member of SPE, SPWLA. Registered professional engineer in Texas.

Herman Acuña, P.E.*

President

Petroleum engineer since 1987. Before joining Ryder Scott, Acuña worked at Exxon Corp. for nine years as a petroleum engineer in reservoir simulation R&D and later in reservoir modeling for depletion strategies, field development, and production optimization. Began career in 1988 as a petroleum engineer at a Tulsa, OK, consulting firm. BS and MS degrees in petroleum engineering, University of Tulsa. Member of the Society of Petroleum Engineers and Association of International Petroleum Negotiators. Registered professional engineer in the state of Texas.

Tosin Famurewa, P.E.*

Executive Vice President

Eric Nelson, P.E.*

Executive Vice President

Petroleum engineer since 2002. Joined Ryder Scott in 2005. Began career at ExxonMobil Corp. as a reservoir engineer for a collection of mature oil-producing assets in West Texas and as lead reservoir simulation engineer for a major heavy oil project in Venezuela. At Ryder Scott, evaluates and audits reserves for a wide variety of reservoirs and geographic areas. BS degree in chemical engineering, University of Tulsa. MBA degree, University of Texas. Registered Professional Engineer in the State of Texas.