Our Team

exploration

Although renewable energy is our target market, our core competency is in geothermal exploration and development. In addition to American geoscientists and engineers, our international staff possess unparalleled diversification and expertise. We have worldwide experience that few other companies can offer. DG is geographically centered in the United States of America with key offices and representatives in Latin America and Europe.

our team

  • Warren T. Dewhurst, Ph.D., P.E.
    Accomplished scientist, engineer, and entrepreneur. Senior executive with over thirty-five years of experience in business management, technology,...
  • Kerry McCallum
    Geothermal Exploration Engineer with a broad background in field engineering operations. Experience in civil, environmental, and exploration...
  • Philip J. Meis
    Accomplished professional engineer, project manager, and entrepreneur.  Co-founded Utility Mapping Services, Inc. (UMSI), and has managed and...
  • Jonathan A. Hernandez, EIT
    UCLA graduate with a B.Sc. in Engineering Geology / Geology. Fluently bilingual, member of the Geothermal Resources...
  • Bastien Poux, MSc and PGEO
    Senior Geologist with more than eight years of experience in geothermal resource exploration and evaluation, wellsite geology...
  • Sebastian T. Vargas
    Over five years of professional experience as a Geologist and Manager at the DG office in Bogota,...
  • Ismael Alfonso Bernal Ortiz
    Professional in Public Accounting, specialized in Finance Management with excellent performance and solid accounting knowledge, development of...
  • Marck Vargas Kolesnikov
    Graphic designer with focus on communication and marketing, specializing in brand management, digital strategies, and sales integration....
  • Elsa Juliana Vega
    University of Caldas graduated with a BS in Geology. Professionally assists in the development of geothermal energy...
  • Lucrecia Acosta Ospina
    Geologist with Dewhurst Group since 2015. Experience in field operations, data acquisition, and geological mapping at the...
  • Sergey N. Domaratskiy, Ph.D.
    Over 30 years’ experience in geophysics and scientific research automation. Experience working at various technical and production...
  • Maxim Petrishchev, Ph.D.
    Dr. Petrishchev is an expert in dynamic system theory and geophysical instrumentation and data analysis with over...
  • Yuri A. Kopytenko, Ph.D.
    Director of the St. Petersburg branch of the Institute for Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation...
  • Matthew D. Minnick, Ph.D.
    Ten years of experience in advanced Geographic Information Systems (GIS) applications, geotechnical engineering, geohydrology, and subsurface flow...
  • Maxim Yu. Smirnov, Ph.D.
    Expert in theory and application of broadband magnetotelluric (BMT) methods. Over 20 years of professional and academic...
  • Sam Abraham Samuel
    Over twenty-three years of experience in the geothermal and oil and gas drilling industry, worked at different...
  • Gustavo Hincapie
    Mr. Hincapié is an experienced field and academic geologist, with extensive experience in geologic mapping, petrography, geothermal...