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Management Team

  • James F. Park, CEO
    James F. Park

    James Park has served as our Chief Executive Officer and as a member of our Board of Directors since co-founding the Company in 2002. James has over 40 years of experience in all phases of the upstream oil and gas business, with a strong background in the acquisition, implementation and management of international projects and teams in North America, South America, Asia, Africa, Europe and the Middle East.

    James received a Bachelor of Science degree in Geophysics from the University of California at Berkeley and previously worked as a research scientist in earthquake and tectonic studies at the University of Texas. In 1978, James helped pioneer the development of commercial oil and gas production in Central America with Basic Resources, an oil and gas exploration company in Guatemala. He remained a member of the Board of Directors until the company was successfully sold in 1997. Mr. Park is also a member of the Board of Directors of Energy Holdings and is a member of the AAPG and SPE. James has lived in Latin America since 2002.


    Andrés Ocampo has served as our Chief Financial Officer since November 2013. He previously served as our Director of Growth and Capital (from January 2011 through October 2013), and has been with our company since July 2010. Mr. Ocampo graduated with a degree in Economics from the Universidad Católica Argentina. He has more than 15 years of experience in business and finance. Before joining our company, Andrés Ocampo worked at Citigroup and served as Vice President Oil & Gas and Soft Commodities at Crédit Agricole Corporate & Investment Bank.

  • PEDRO E. AYLWIN, Legal Director

    Pedro Aylwin has served as a member of our board of directors since July 2013 and as our Director of Legal and Governance since April 2011. From 2003 to 2006, Pedro worked for us as an advisor on governance and legal matters. Mr. Aylwin holds a degree in law from the Universidad de Chile and an LLM from the University of Notre Dame. Pedro has extensive experience in the natural resources sector. He is also a partner at the law firm Aylwin, Mendoza, Luksic, Valencia Abogados in Santiago, Chile, where he represented mining, chemical and oil and gas companies in numerous transactions. From 2006 until 2011, he served as Lead Manager and General Counsel at BHP Billiton, Base Metals, where he was in charge of legal and corporate governance matters on BHP Billiton’s projects, operations and natural resource assets in South America, North America, Asia, Africa and Australia.

  • Augusto Zubillaga, Chief Operating Officer
    Augusto Zubillaga

    Augusto Zubillaga has served as our Chief Operating Officer since May 2015. He previously served in other management positions throughout the Company including Operations Director, Director for Argentina and Production Director. He is a petroleum engineer with 20 years of experience in production, engineering, well completion, corrosion control, reservoir management and field development. He has a degree in petroleum engineering from the Instituto Tecnologico of Buenos Aires. Prior to joining our company, Mr. Zubillaga worked for Petrolera Argentina San Jorge S.A. and Chevron San Jorge S.A. At Chevron San Jorge S.A., he led multi-disciplinary teams focused on improving production, costs and safety, and was the leader of the Asset Development Team, which was responsible for creating the field development plan, and estimating and auditing the oil and gas reserves of the Trapial field in Argentina. Additionally, at Chevron San Jorge S.A., Mr. Zubillaga was also part of the team that was responsible for the identification of business opportunities and also worked with the head office on the set up of the best business practices. He is the author of several industry papers, related to different matters, such as electrical submersible pump optimization, corrosion control, water handling and intelligent production systems.

  • MARTÍN TERRADO, Director of Operations

    Martín joined our company in August 2018. He has more than 20 years of experience in the oil industry, working in field development and operations. Before joining GeoPark, Martín worked for Petrolera Argentina San Jorge S.A. and Chevron in international operations, including in Argentina, the United States and Venezuela.

    Over the past 6 years, he led heavy oil operations at fields in Venezuela. Before that, he was responsible for water injection, CO2 flooding and unconventional operations.

    Martín has a degree in petroleum engineering from the Buenos Aires Institute of Technology (ITBA) and an M.B.A. from the IAE Business School of the Austral University of Argentina.

  • Alberto Matamoros, Director for Argentina and Chile
    Alberto Matamoros

    Alberto Matamoros is our Director for Argentina and Chile. Before he was our Director for Chile. He is an industrial engineer and also has a MBA; with more than 17 years of experience in the Oil & Gas industry. He started his career in the Argentinian oil company ASTRA, as a Production Engineer of La Ventana-Vizcacheras Block in the province of Mendoza (1997-2000). He then joined Chevron, where he worked for three years as a Production Engineer in El Trapial Block in the province of Neuquén. Later, while working for the same company, he was appointed as Field Engineering Manager in Buenos Aires, a function he carried out for three more years; then he was transferred to Kern County, California, to lead the production team. His experience in Chevron enabled him to manage different technical and administrative teams, designing and executing working plans focused on the optimization of resources. In 2014, he joined GeoPark to be part of the Corporate Operation team before being selected as the new Country Manager of GeoPark in Chile. Mr. Matamoros holds a degree in Industrial Engineering from the Universidad Nacional del Sur and an MBA awarded in IAE, from the Business School of Universidad Austral of Buenos Aires, Argentina.

  • MARCELA VACA, Director for Colombia

    Marcela Vaca has been our Director for Colombia since August 2012. Marcela holds a degree in law from Pontificia Universidad Javeriana in Bogotá, Colombia, a Master’s Degree in commercial law from the same university and an LLM from Georgetown University. She  served in the legal department of a number of companies in the mining and energy sector in Colombia. In  2000 Marcela joined GHK Company Colombia leading the legal, social and environmental strategy  for the development of the Guaduas field and  the construction of its pipeline.  Prior to joining our company in 2012, Marcela served for nine years as the General Manager of the  Hupecol Group,  led the development of the Caracara field, the construction of the Jaguar – Santiago Pipeline, and was also involved in the structuring of the company’s asset development, its financing  and sales strategy.

  • BARBARA BRUCE, Director for Peru

    Barbara Bruce has been our Director for Peru since June 2017. Ms. Bruce holds a degree in Geology from the Universidad Nacional de Ingeniería, Lima, Peru, a Master’s degree in Reservoirs from Colorado School of Mines, USA and an MBA from Universidad Adolfo Ibañez, USA/Chile. Before joining GeoPark, she previously worked with Occidental Petroleum in different international operations, including in the Caño Limon field in Colombia and the Dhurnal and Bhangali gas fields in Pakistan. Barbara later worked as deputy President of an offshore operation by Petrotech Peruana, joined Hunt Oil and as General Manager of Peru LNG, leading the construction and startup of operation of Peru´s first LNG plant and managed the exploration venture of Hunt Oil in Madre de Dios, Peru.

  • LIVIA VALVERDE, Director for Brazil

    Livia Valverde has been our Director for Brazil since 2018. She previously served as our Legal Manager and has been with our company since 2013. She is a lawyer graduated from the Catholic University of Salvador in Brazil and holds a Master´s Degree in Corporate Law from the Brazilian Institute of Capital Markets and an MBA in Environmental Management from the Getulio Vargas Foundation. With more than 16 years of experience in the industry of oil and gas exploration and production, she has served as Legal and Environmental Manager in the company Rio das Contas Produtora de Petróleo Ltda., where she was responsible for analyzing contracts, drafting company documents and managing relationships with public entities. Livia has a broad experience in the qualification of companies for bidding participation promoted by the National Agency of Petroleum, Natural Gas and Biofuel of Brazil, as well as merge and acquisition processes, including the purchase and sale of company and assets.


  • Carlos Murut, Director of Development
    Carlos Murut

    Carlos Murut has been our technical director of new business since October 2018. Previously, he was our director of development and also as manager of development. Carlos holds a master’s degree in petroleum geology from the University of Buenos Aires, where he also completed postgraduate studies in reservoir engineering with a specialization in reservoir exploitation. He also completed a business management development program at the Austral University of Argentina. Carlos Murut has more than 40 years of experience working for international companies and major oil companies, including YPF S.A., Tecpetrol S.A., Petrolera Argentina San Jorge S.A. and Chevron San Jorge S.A.

  • Salvador Minniti, Director of Exploration
    Salvador Minniti

    Salvador Minniti has been our Director of Exploration since January 2012. He previously served as our Exploration Manager. He holds a bachelor degree in geology from Universidad Nacional de La Plata and has a graduate degree in oil geology from the Instituto Argentino. Mr. Minniti has over 31 years of experience in oil exploration and has worked in YPF S.A., Petrolera Argentina San Jorge S.A. and Chevron Argentina.

  • Horacio Fontana, Director of Drilling
    Horacio Fontana

    Horacio Fontana has been our Corporate Drilling Manager since March 2012. He previously served as our Engineer Manager. He holds a degree in civil engineering from the Universidad Nacional de Rosario and is also a graduate from the Argentine Oil and Gas Institute, National University of Buenos Aires, with a specialty in oilfield exploitation and an extensive background in drilling operations. He has recently taken part in a Management Development Program at IAE Business School of Austral University. Mr. Fontana has over 26 years of drilling experience in major Argentine companies such as YPF S.A., Petrolera Argentina San Jorge and Chevron.

  • Agustina Wisky, Director of Capabilities and Culture
    Agustina Wisky

    Agustina Wisky has worked with our Company since it was founded in November 2002 and has been our Director of Capabilities and Culture since 2018. She previously served as our Director of Performance and as our Director of People since 2012 until December 2016. Agustina is a public accountant, and also holds a degree in human resources from IAE, the Business School of Universidad Austral of Buenos Aires, Argentina. She has over 15 years of experience in the oil industry. Before joining our company, Mrs. Wisky worked at AES Gener and PricewaterhouseCoopers.


    Guillermo Portnoi has worked with our Company since June 2006 and has been our Director of Business Management since May 2015 until December 2016 and is currently our Director of New Business. Previously, he also served as our Director of Administration and Finance. Guillermo is a public accountant and holds an MBA from Universidad Austral—IAE. He has more than 14 years of experience in the oil industry. Before joining our company, Guillermo worked at Pluspetrol, Río Alto and PricewaterhouseCoopers, where he counted several major oil companies as his clients.

  • STACY STEIMEL, Shareholder Value Director

    Stacy Steimel joined GeoPark in February 2017 as our Shareholder Value Director. Mrs. Steimel has more than 20 years of experience in the financial sector as Fund Manager and subsequently as regional CEO for PineBridge Investments, ex-AIG Investments in Latin America. Before AIG, Stacy held positions in the US Treasury Department and at the InterAmerican Development Bank. She holds an MBA from the Pontificia Universidad Católica de Chile, an MA in Latin American Studies from the University of Texas at Austin and a BA from the College of William and Mary.

  • ADRIANA LA ROTTA, Director of Connections

    Adriana La Rotta has been our Director of Connections since November 2018, being responsible for GeoPark’s institutional affairs, internal and external communications. Adriana is a communications professional and award-winning journalist with broad experience in Latin America, Asia, and the United States. For over six years she led the media relations strategy for Americas Society/Council of the Americas, a New York-headquartered business organization whose members are international corporations representing a broad range of industries. Previously she was a TV reporter and anchor in her native Colombia and worked as a foreign correspondent in Brazil, the United States, Japan, and Hong Kong. She has a BA in Journalism from Colombia’s Universidad Javeriana and a certificate in NGO Management from Temple University-Japan.

  • Norma Yolanda Sánchez, Social & Environmental Manager
    Norma Yolanda Sánchez

    Norma Sánchez was awarded the degree of Social Worker at Universidad Industrial de Santander in Colombia and holds a Masters in Corporate Social Responsibility, Accounting and Social Audit of the University of Barcelona. She has over 24 years’ experience in the industry. Before joining our company, she worked in Perenco Colombia Limited, Alange Energy Corp, Glencore, Petrobras and Ecopetrol.

  • CARLOS GÓMEZ, Safety Manager

    Carlos Gomez has served as our Safety and Health Manager since 2014. Carlos is a Petroleum Engineer from the American University of Bogotá and he has a specialization in Industrial Safety, Health and Environment from the Universidad Agraria of Colombia. He has over 20 years of experience working in different countries of Latin America like Pride International, San Antonio Internacional, Baker Hughes and Ecopetrol.

  • Sabrina García, Information Management Manager
    Sabrina García

    Sabrina Garcia joined the company in 2008, to be part of the Accounting team, and later became the Information Management Supervisor. She was awarded the degree of Public Accountant at Universidad Argentina de la Empresa, and she participated in the Management Development Program 2015, at IAE. She has more than 12 years of experience (PWC).

  • Veronica Hayden, Corporate People Manager
    Veronica Hayden

    Verónica Hayden joined our Company in 2013, and has worked as Organizational Development Manager and Regional People Manager previously. Currently she serves as Corporate People Manager. Mrs.Hayden holds a B.A. Degree in Educational Sciences , and also holds a Post degree in Human Resources Management from San Andrés University. She has over 17 years of experience in Oil & Gas Industry. Before joining our company, she worked at Perez Companc and Petrobras Energía S.A.

Important Notice

Recommended cash offer (the Offer) for Amerisur Resources plc (Amerisur) by GeoPark Colombia S.A.S. (the GeoPark Colombia), a wholly owned subsidiary of GeoPark Limited (GeoPark).



Basis of access to the Micro-Site

Please read this notice carefully before clicking "I agree" or "I disagree" below. This notice applies to all persons who view the Micro-Site. This notice may be amended or updated by GeoPark Colombia from time to time and accordingly it should be read carefully in full each time you wish to view the Micro-Site. In addition, the content of the Micro-Site, and its availability to persons resident in certain jurisdictions, may be amended at any time in whole or in part at the sole discretion of GeoPark Colombia.

Any person seeking access to the Micro-Site represents and warrants to GeoPark Colombia that they are doing so for information purposes only. Making the Information available does not constitute an offer to sell or the solicitation of an offer to buy shares in Amerisur. Further, it does not constitute a recommendation by GeoPark Colombia or any other party to sell or buy securities in Amerisur.

The Offer cannot be validly accepted by holders of Amerisur shares or any other persons through means of downloading any Information from this Micro-Site.

Amerisur shareholders should seek advice from an independent financial adviser as to the suitability of any action for the individual concerned in connection with the Offer. Any shareholder action required in connection with the Offer will be set out in documents sent to or made available to Amerisur’ shareholders and any decision made by such shareholders should be made solely and only on the basis of information provided in those documents.

Overseas persons

Viewing the Information in jurisdictions other than the United Kingdom may be prohibited or restricted by applicable law and regulation. In some jurisdictions, only certain categories of person are allowed to view the Information. Any person resident outside the United Kingdom who wishes to view the Information must first satisfy themselves that they are not subject to any local requirements that prohibit or restrict them from doing so.

Copies of any documents relating to the Offer are not being, and must not be, directly or indirectly, mailed or otherwise forwarded, transmitted, distributed, sent or accessed in or into or from any jurisdiction where to do so would violate the laws in that jurisdiction (a Restricted Jurisdiction). Persons receiving such documents (including, without limitation, custodians, nominees and trustees) should observe these restrictions and must not mail or otherwise forward, transmit, distribute or send them in or into or from any Restricted Jurisdiction.

If you are not permitted to download or view the Information, or if downloading or viewing the Information would result in a breach of the above, or if you are in any doubt as to whether you are permitted to download or view the Information, please exit this webpage by clicking on the "I disagree" box below.

This part of the website contains information that has been prepared for the purpose of complying with English law and the Takeover Code and the information disclosed may not be the same as that which would have been disclosed if this information had been prepared in accordance with the laws of jurisdictions outside of England.

Notice to US investors

Shareholders of Amerisur ordinarily resident in the US or with a registered address in the US (and any custodian, nominee or trustee holding Amerisur shares for persons in the US or with a registered address in the US) (US Holders) should note that the Offer relates to the securities of an English company and is subject to UK disclosure requirements and practices (which are different from those of the US).

The Offer may be effected by means of a scheme of arrangement or a takeover offer. A scheme of arrangement under English company law is not subject to the tender offer rules under the US Exchange Act of 1934 and the rules and regulations promulgated thereunder (as amended) (the US Exchange Act), and the proxy solicitation rules under the US Exchange Act would not apply to such an offer. A scheme of arrangement would be subject to UK disclosure requirements and practices, which are different from the disclosure requirements of the US tender offer and proxy solicitation rules. Any financial information included in this section of the website has been prepared in accordance with International Financial Reporting Standards (IFRS), and thus may not be comparable to financial information of companies whose financial statements are prepared in accordance with generally accepted accounting principles in the US. If GeoPark Colombia were to implement the Offer by way of a takeover offer, any such takeover offer would be made in compliance with applicable US tender offer and securities laws and regulations.

It may be difficult for US Holders to enforce their rights and claims arising out of the US federal securities laws, since GeoPark Colombia and Amerisur are located in countries other than the US, and some or all of their officers and directors may be residents of countries other than the US. US Holders may not be able to sue a non-US company or its officers or directors in a non-US court for violations of US securities laws. Further, it may be difficult to compel a non-US company and its affiliates to subject themselves to a US court's judgement.

Forward looking statements

The Information may contain "forward-looking statements" relating to Amerisur, GeoPark and GeoPark Colombia and the business sectors in which they operate. All statements other than statements of historical facts included in this announcement may be forward looking statements. Without limitation, any statements preceded or followed by or that include the words "targets", "goals", "should", "would", "could", "continue", "plans", "believes", "expects", "aims", "intends", "will", "may", "anticipates", "estimates", "hopes", "projects" or words or terms of similar substance or the negative thereof, are forward looking statements. Forward looking statements include statements relating to the following: (i) future capital expenditures, expenses, revenues, earnings, synergies, economic performance, indebtedness, financial condition, dividend policy, losses and future prospects; (ii) business and management strategies and the expansion and growth of Amerisur's or GeoPark's operations and potential synergies resulting from the Transaction; and (iii) the effects of government regulation on Amerisur's or GeoPark's business. Such forward looking statements involve risks and uncertainties that could significantly affect expected results and are based on certain key assumptions. Many factors could cause actual results to differ materially from those projected or implied in any forward looking statements. Due to such uncertainties and risks, readers are cautioned not to place undue reliance on such forward looking statements, which speak only as of the date hereof. Amerisur, GeoPark and GeoPark Colombia disclaim any obligation to update any forward looking or other statements contained herein, except as required by applicable law or regulation.

Unless expressly stated otherwise, no statement contained or referred to in this Microsite is intended to be a profit forecast or profit estimate and no such statement should be interpreted to mean that the earnings or future earnings per share of or dividends or future dividends per share of GeoPark and/or Amerisur for current or future financial years will necessarily match or exceed the historical or published earnings or dividends per share of GeoPark or Amerisur, as appropriate.


In relation to any Information, the only responsibility accepted by GeoPark and GeoPark Colombia is for the correctness of its reproduction, unless the responsibility statement in any relevant document expressly provides otherwise.

Neither GeoPark nor GeoPark Colombia nor their affiliated companies have reviewed and none of them are responsible for, or accepts any liability in respect of, any information on any other website that may be linked to this website by a third party.

If you are in any doubt about the contents of the Micro-Site or the action you should take, you should seek your own financial advice from an independent financial adviser authorised under the Financial Services and Markets Act 2000 or, if you are located outside the United Kingdom, from an appropriately authorised independent financial adviser.

N.M. Rothschild & Sons Limited, authorised and regulated in the United Kingdom by the Financial Conduct Authority, is acting exclusively for GeoPark and no-one else in connection with the Offer and will not be responsible to anyone other than GeoPark for providing the protections afforded to clients of N.M. Rothschild & Sons Limited or for providing advice in relation to the Offer or any other matter referred to in the Information.


This notice shall be governed by, and interpreted in accordance with, English law.

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