Working together for our

communities and our planet.

Staff 2017-05-22T10:53:23+00:00
GPI Staff

Meet our dedicated Staff and Board

Our Staff and Board members have many decades of combined background in geoscientific and engineering endeavors, with practical experience in nearly every realm of geology and related construction and technology industries. We have worked in mineral and energy exploration, mining geology, hazard mapping and abatement, geochemical and stratigraphic studies, field and structural geology, remote sensing and engineering applications. Together, we have worked in nearly every state of the union as well as a number of countries in Europe and South America. We share a passion to apply our skills for the betterment of mankind and our planet, as well as an ability to work in challenging situations. We welcome difficult problems that demand creative solutions.


Greg Wessel

Gregory R. Wessel, President, Treasurer, and Chair of the Board of Directors

Dr. Wessel holds degrees in Geology from Colorado School of Mines (PhD) and the University of Missouri-Rolla (BSc and MSc; now called the Missouri University of Science and Technology).  He is also licensed in the State of Washington as an Engineering Geologist and currently sits on the State’s Geologist Licensing Board. Dr. Wessel has over 35 years of experience in metals and industrial minerals exploration, geologic hazard abatement and environmental restoration, geotechnical applications and mapping of geologic hazards, the development of agricultural minerals (sulfur and potash) in Texas, Poland, Ukraine, and Russia, and the recovery of magnesium salts (for metal production) in Russia. He has specialized in geologic mapping and structural evaluations, and has mapped large areas of the southwestern United States and the Altiplano of Bolivia, using aerial photography and extensive field work. Dr. Wessel has authored or co-authored over 20 articles and abstracts, including a number of maps available from the Washington Division of Geology and Earth Resources, the Texas Bureau of Economic Geology, and a widely used educational chart available from the Geological Society of America entitled The Geology of Plate Tectonics. Dr. Wessel also serves on the Mapping Advisory Committee for the Washington Division of Geology and Earth Resources.

Margaret Wessel

Margaret R. Wessel, Vice President and Secretary

Ms. Wessel holds degrees in geology from Southeast Missouri State University (BSc) and Southern Illinois University (MSc) and a Master of Business Administration from the University of Oklahoma.  She is a Licensed Geologist in the state of Washington and serves on the board of the local water utility. Ms. Wessel’s geologic background is diverse and includes expertise in igneous petrology, oil exploration, and geotechnical issues. Her thirty years of professional experience includes positions with the Oklahoma Geological Survey and ARCO Oil and Gas Company, as well as stints in teaching and in providing scientific support to litigators in high-profile tobacco and asbestos cases. Ms. Wessel is currently a forensic scientist with Vertex Engineering Services, where her projects have included such diverse topics as environmental pollution claims, evaluating the potential for damage to structures from sinkhole formation, and studying the effects of construction vibrations on homes.

Board of Directors

John Kane

John P. Kane Jr.

Mr. Kane holds a BA in Business Administration and Economics from the University of Washington.  He recently retired from his position as a Supervisor with the King County (WA) Department of Natural Resources and Parks, and has over 37 years of experience in construction, project management, land use, and development, including 11 years with the King County Department of Development and Environmental Services. Prior to that, Mr. Kane was President and General Manager of J. Kane and Company, a project management and commercial construction firm, where he was responsible for administration, production, and sales.  He was also General Manager, and later Director of Operations, for two companies specializing in asbestos abatement. Prior to that, he was Safety Director for both Pan Am World Airways and the City of Seattle Water Department, where he was awarded the Safety Man of the Year award by the Governor of the State of Washington.

Warren Maierhofer

Warren T. Maierhofer

Mr. Maierhofer holds a BSc in Chemical and Petroleum Refining Engineering from Colorado School of Mines and graduate studies in Human Ecology from the University of Colorado at Denver. He is licensed as a professional engineer in four states and is an NCEES Model Engineer. Currently teaching physics and math at a high school in the Seattle area, he was previously Vice President and Lead Forensic Engineer of Vertex Engineering Services where he managed complex public infrastructure, private redevelopment and environmental restoration projects. With Vertex, and before that as Vice President and COO of Applied EcoSystems Inc. and Project Engineer with Groundwater Technology Inc., he acquired extensive experience in the remediation and redevelopment of pollution-impaired sites and managed distressed or abandoned construction projects. Mr. Maierhofer supervised the completion of a municipal wastewater treatment system, the cleanup of a contaminated property in Denver that contained uncharacterized drummed wastes and underground storage tanks, and the construction of soil treatment facilities for a major oil company.  He has prepared acid mine drainage treatment plans for several metals mining operations, including Climax Molybdenum, the Summitville Superfund site, Sunnyside Gold Corporation/Mayflower Mill, and the Leadville/Yak Tunnel Superfund site (all in Colorado). He has also worked on remediation projects overseas, including petroleum waste characterization and monitoring in Peru, water and sewer repairs following hurricane damage in Nicaragua, and damage assessment following a gas well explosion in Bangladesh.

Eric Tilman

J. Erik Tilman

Mr. Tilman holds a BSc in Mechanical Engineering from the University of Missouri-Rolla (now called the Missouri University of Science and Technology). He has 30 years of experience with design and manufacturing in the electronics Industry, including a long record with Hewlett Packard Corporation in Loveland, Colorado and Lake Stevens, Washington.  He presently is working as a mechanical engineer for The Boeing Company designing components of commercial aircraft. Mr. Tilman currently is also on the Board of Directors of the Centennial Trail Coalition of Snohomish County, a non-profit organization that assists Snohomish County Parks by advocating for and promoting long distance recreation trails for pedestrians, bicyclists, and equestrians.

Nate Wessel

Nathaniel G. Wessel

Mr. Wessel holds a BSc in Computer Science and a BSc in Psychology from Colorado State University.  He currently implements firmware for next-generation solid-state storage devices when he is not backpacking, riding his dirt bike, or being tackled by his dogs. Mr. Wessel is well traveled and exceptionally versed in internet applications to marketing and development. He has also worked with a number of Colorado companies to maintain and upgrade their corporate computer systems, provided customer support for a variety of platforms and mobile devices, and worked with other scientists and engineers to develop new products for biological applications.