IRT Associates

Prior to their association with IRT, all of our Senior Associates gained extensive experience with operating companies and/or other major international consulting companies. Years of experience, as stated herein, equates to years of industry or related experience since graduation and includes post-graduate studies. Detailed resumes of all our personnel including several consulting associates not included here are available upon request.

Ms. Lisë Brinton  (Senior Associate Consultant - Geoscience) has over 28 years experience in sedimentology, petrography, and strgraphy applied to petroleum exploration, field development, and reservoir characterization. She is recognized for her experience in core description and thin section petrography in carbonate, mixed carbonate-clastic, and clastic depositional systems and has worldwide experience in interpreting core and petrographic information for integration and application to complex, multidisciplinary, exploration and reservoir studies. Ms Brinton has extensive project experience in the application of sequence stratigraphic concepts, depositional systems and diagenesis modeling, recognition and evaluation of complex geologic relationships, and controls on petroleum reservoir occurrence and distribution. Her professional experience includes projects in the United States, Tunisia, Algeria, Morocco, Bulgaria, Italy, Abu Dhabi, Kuwait, and Colombia.


Mr. Nicholas J. Cavaleri (Senior Consultant - Engineering) has over 40 years petroleum engineering experience in on-shore / offshore projects within the United States as well as internationally. Areas of expertise consist of, but are not limited to the following: reservoir simulation, reserve and performance determination, reservoir characterization, waterflood evaluation and design, log interpretation, pressure transient analysis, simulation and report writing/editing, and project management. He has worked on oil, gas, oil shale, coal bed methane and gas storage projects. Mr. Cavaleri has participated in projects located in Mexico, South America, Africa, Russia, Indonesia, the Middle East and the United States.


Mr. James D. Copen (Senior Associate Consultant - Geoscience) has spent over 30 years focusing on the geologic aspects of petroleum exploration, appraisal, development, and production. He has experience in a wide variety of reservoirs onshore in the continental U.S., Alaska North Slope and Kuwait; and offshore Gulf of Mexico and California. Mr. Copen has a particularly strong background in large field waterflood management, new field development, and "challenged" (e.g. thin, tight sandstone) reservoir depletion planning and development. His exploration experience encompasses onshore (Rocky Mountain intermontane basins, overthrust, basin and range, California basins and offshore. He has considerable experience forming and leading large multi-disciplinary (and multi-company) description and modeling teams. Mr. Copen's strengths include all aspects of Operations Geoscience. He has managed a team of up to 15 operations geologists. He also has a strong background in coaching and mentoring and has co-developed and taught courses on subjects ranging from introductory petroleum geology to reservoir description to advanced well planning and operations geology.


Mr. Terry B. Eschner (Senior Associate Consultant - Geoscience) Mr. Eschner is a geologist with over 24 years of experience in exploration and production, prospect generation and evaluation, structural analysis, sequence stratigraphy, core studies, sedimentology, seismic interpretation, reservoir characterization and reservoir management. He has a strong background in the thrust belts of Colombia, Bolivia, Argentina, Wyoming and Montana. He has exploration and production experience in Algeria, Kuwait, Mexico, Colombia, Venezuela, Bolivia, Argentina, Guyana, and many basins in the U.S.A. including those in the Mid-Continent, California and Alaska. He is highly skilled in prospect generation and evaluation, identifying deeper-pool, step-out and behind-pipe opportunities, regional and field-scale structural analysis, siliciclastic core description and the integration of geological, geophysical, petrophysical and engineering data. He has strong expertise in working with deposits from various depositional environments, particularly eolian, fluvial, deltaic and shallow marine. He has used the Statistical Curvature Analysis Technique to evaluate dipmeters from hundreds of wells.


Ms. Laura Foulk (Senior Associate Consultant - Geoscience) has over 30 years experience in the oil and gas industry. For the past 25 years she has specialized in the interpretation of wellbore images. Having interpreted images from a variety of tectonic and depositional settings worldwide, she focuses on extracting the structural and stratigraphic information obtained through image interpretation and integrating those data with petrophysical, geologic and geophysical data. She routinely uses image data to correlate core to logs, and perform geologic and petrophysical interpretations. In addition to her interpretation work, she teaches domestic and international courses on structural and stratigraphic interpretation of wellbore images. She has worked on reservoir characterization projects worldwide, including recent projects with the tight gas sandstone of the Rocky Mountains, fractured shales of the Devonian and Ordovician, Permian Basin carbonates, Deep Water Gulf of Mexico turbidites, carbonate and clastic systems in Kuwait, Columbian fluvio-deltaics, Hungarian Miocene clastics with volcanic tuffs, and mixed tectonic systems of California.


Dr. Steven M. Goolsby (Senior Associate Consultant - Geoscience / Petrophysics) has 28 years of digital log analysis (shaly sandstone, multi-mineral complex lithology, thin bed, unusual environmental conditions), rock to log petrophysical integration, and neural network and resistivity inversion modeling.  His background also includes petrographic studies, formation damage evaluation and remedial recommendations, prospect and play generation and evaluation, basin studies, geologic well-site supervision and core description.


Mr. George Grinestaff (Senior Associate Consultant - Engineering) is a reservoir engineer with expertise in reservoir modeling and simulation. He has also worked on drilling rigs, operated wells, surface facilities and the design, planning, and execution of horizontal wells. He has a unique gift to understand reservoir mechanisms, wells, and coupled facilities, which accurately predict performance of oil and gas plays.


Dr. Masoud Haajizadeh (Senior Associate Consultant - Engineering) has over 30 years of experience in reservoir engineering wit BP. He has worked on oil, gas and condensate reservoirs in various BP centers, including San Francisco (SOHIO), Anchorage, Glasgow, Sunbury, Abu Dhabi (ADCO) and Norway. His areas of expertise include: compositional and black-oil simulation; gas/WAG injection EOR; sandstone and carbonate formations; conventional and fractured reservoirs; well and reservoir performance evaluation; pilot design, management and analysis; prospect assessment, reservoir appraisal and field development; reserves evaluation and maturation. His leadership and interpersonal skills comprise: subsurface project planning, leading and execution; depletion planning and risk assessment; reservoir management; technology project management; peer reviews; advising, supervising, and staff development; leading or working in multi-discipline teams to resolve complex technical and commercial issues. He holds Masters of Science and PhD degrees in mechanical engineering from University of California at Berkeley. His hands on experience in a broad range of reservoir engineering projects and technical leadership skills, along with business focus and solid track record of high quality project delivery against tight schedules, would make him qualified for any reservoir engineering challenges.


Mr. David R. Jefferis (Senior Associate Consultant - Geology) has over 25 years experience in reservoir studies including statigraphic correlation, core description and analysis, applied geostatistics, 3D geological and property modeling, volumetric analysis of original and current hydrocarbons in-place (uncertainty analysis); well planning, reservoir surveillance, and construction and initialization of reservoir simulation models. Additionally, he has extensive experience with geological modeling systems. He developed numerical models of petroleum reservoirs in many geological environments worldwide in support of exploration, development, production, and EOR projects. Mr. Jefferis is experienced with developing 3D geological and velocity models and with using streamline simulation.


Mr. Edward A. Koerperich (Senior Associate Consultant - Petrophysics) has over 40 years petroleum engineering experience including 25 years as independent consultant and 14 years with Shell Oil Company and Shell R&D. Areas of expertise include petrophysical engineering, reserve/economic/equity valuations, acquisitions & divestitures, technical support for litigation issues and project planning & coordination. Geographical experience areas include the Continental United States, Alaska, Mexico, Canada and International. Recent emphasis on these basins: Williston (Bakken), Alberta (Banff, Bakken, Three Forks, Nisku), Uinta (Green River), Greater Green River (Almond, Ericson), Powder River (Turner), DJ (Niobrara) and Sacramento (shaly sand sequences).


Dr. Wayne P. Kraus (Senior Associate Consultant - Engineering) has over 29 years of experience in the petroleum industry covering both upstream and downstream refining operations. He has been responsible for research and development in the areas of reservoir simulation and facilities process design simulation. He has developed and taught industry courses in reservoir simulation and process simulation. Over the past 22 years he has been involved in reservoir engineering consulting work for a range of petroleum recovery processes including primary recovery, waterflooding, EOR and thermal recovery projects. Much of this consulting work involved the application of simulation models to achieve optimal integrated recovery strategies. He served as director for heavy oil research for the Canadian affiliate of a major United States oil company.


Mr. Mark C. Lederer (Senior Associate Consultant - Engineering) is a reservoir engineer with over 32 years experience in computer based reservoir studies and reservoir simulation. He has been responsible for research and development in the areas of reservoir simulation, forecasting systems, and pre- and post-processor systems. Mr. Lederer has performed reservoir studies for Alaska, Colombia, and North Sea assets. His expertise also includes building and history matching compositional full field models for EOR optimization.


Dr. Margaret A. Lessenger (Senior Associate Consultant - Petrophysics) is a petrophysicist with over 30 years broad experience in petroleum geology and geophysics. She has a proven track record of solving difficult petroleum exploration and production problems using creative and innovative approaches based on sound scientific and engineering principles. Ms. Lessenger specializes in unconventional resource petrophysics, integrated petrophysical data analytics, basin-scale sequence stratigraphy, sedimentology, basin analysis, petroleum system basin modeling, and stratigraphic simulation modeling.Petrophysics) is a petrophysicist with over 30 years broad experience in petroleum geology and geophysics. She has a proven track record of solving difficult petroleum exploration and production problems using creative and innovative approaches based on sound scientific and engineering principles. Ms. Lessenger specializes in unconventional resource petrophysics, integrated petrophysical data analytics, basin-scale sequence stratigraphy, sedimentology, basin analysis, petroleum system basin modeling, and stratigraphic simulation modeling.


Mr. David List (Senior Associate Consultant - Geology) is a petroleum geologist/geophysicist with over 30 years of technical and project management experience working in interdisciplinary teams. Generated and evaluated stratigraphic prospects and developed fields in the Rocky Mountains (Williston, Powder River, Paradox, Red Desert, Big Horn and Green River basins). Experience in Argentina, Columbia, Venezuela, Mexico, Algeria, China, and Kuwait. Adept at interpreting and integrating geologic, geophysical, petrophysical, and engineering data into consistent geologic models for development and exploratory purposes. Skilled in the use of workstations for databasing, seismic modeling, velocity modeling, seismic interpretation, log correlation, stratigraphic and structural analysis, and mapping. Strong background in developing and implementing innovative and efficient workflows for streamlining reservoir characterization and exploration projects. Experience with fractured and conventional reservoirs, clastic and carbonate depositional environments in a variety of structural settings.


Ms. Rachael Mays (Senior Associate Consultant / Petrophysics) has over 28 years of valuable petrophysical experience which was acquired worldwide in a variety of working environments. She has also worked as a senior consulting petrophysicist working a wide variety of both domestic and international projects for large national oil companies to small domestic operators. In addition, she is highly proficient at performing single well or full field reservoir studies integrating log analysis, core description, reservoir fluid properties, well test analysis, completion history, and production data. Ms. Mays has been fully responsible for the design and implementation of innovative log and coring programs, meeting all objectives while minimizing cost and risk.


Dr. Katie-Joe McDonough (Senior Associate Consultant / Geology) is a geological/geophysical consultant specializing in sequence stratigraphic and seismic interpretation applied to exploration and production. Dr. McDonough pursues thorough integration of multiple data types (outcrop, core, well log and seismic) to arrive at rigorous and consistent stratigraphic/sedimentological interpretations. She has explored in siliciclastics and carbonates in shallow to deep marine settings of various basins of North and South America, offshore West Africa, the North Sea, Indonesia and East Africa, and has conducted in-house sequence stratigraphy short courses for the industry. She has over 19 years of experience in the petroleum industry including staff, consulting and mentoring positions with Exxon USA, Mobil, Elf Acquitaine, EcoPetrol, Cimarex Energy, MedcoEnergi Jakarta, Noble Energy, Anschutz Exploration, Enerplus and ION Geophysical. She is an active member of AAPG (2001 Annual Conference Organizing Committee), DGS, RMAG, SEPM-RMS, SEG, WTGS. She received her BS and degree in Geology (Geophysics Option) from the University of Texas at Austin, and her MS and Ph.D. in Geological Engineering from the Colorado School of Mines (dissertation : Stratigraphic architecture of the Vercors carbonate ramp: Linked clinoform geometries and facies differentiation ...) She has also served as adjunct faculty teaching stratigraphy at Colorado School of Mines.


Mr. Ron Mossbarger (Senior Associate Consultant - Engineering) has over 35 years of experience in the areas of reservoir and pipeline simulation, including long stints with Chevron, Scientific Software . Intercomp and Halliburton. He has extensive experience with Nexus, VIP and Eclipse and has worked with many clients worldwide, with emphasis in the Middle East, North Sea, offshore Africa and the Gulf of Mexico. In addition to traditional reservoir simulation, Mr. Mossbarger has been involved in a large number of Integrated Asset Management projects coupling reservoir and surface facility modeling for full-field predictive modeling.


Mr. Chet Paris (Senior Associate Consultant - Geology) is a petroleum geologist who has spent over 30 years discovering and maturing oil and gas fields with both major and independent petroleum companies in the Rockies, Alaska, Gulf of Mexico, and the North Sea. He uses a "Big Picture" approach and his breadth of experience and networking to integrate geology, geophysics, and engineering into profitable oil and gas opportunities.


Dr. Eric S. Pasternack (Senior Associate Consultant - Petrophysics) has over 37 years of experience in petrophysics, well log interpretation of open and cased-hole wireline log data, and integrated reservoir studies. Dr. Pasternack is recognized for his Russian log expertise and training in the interpretation of Russian logs. He has also provided support for unconventional plays and CO2 EOR programs.


Dr. Isak Rusinek (Senior Associate Consultant - Engineering) has broad expertise in Reservoir Engineering, Reservoir Simulation, Reservoir Appraisal, Development and Management as well as in Data/Work Integration into Reservoir Models and Studies.


Mr. Robert J. Skinner (Senior Associate Consultant - Engineering) is a petroleum engineer registered in Colorado and California and has over 35 years of experience with emphasis on reservoir simulation. His background includes coordinating fully integrated studies, providing reservoir engineering input to unitization, drilling and facilities groups, acting as an expert advisor, and providing staff training. In addition to heading his own consulting company, he has held senior engineering positions with two other international consulting firms, an independent producer, and with a government regulatory agency.


Ms. Susan Starr (Senior Associate Consultant - Engineering) is a reservoir and production engineer with over 35 years in the industry. She is a principal partner and owner of an oil and gas consultancy specializing in asset evaluation, reserves progression, front end project appraisal, and organizational design. Her experience in engineering, management and executive leadership in major integrated oil and gas companies includes BP, TNK-BP, and Conoco. Extensive US and international experience in Russia and the FSU, North Sea, Canada, Alaska, and the Gulf of Mexico Shelf.


Mr. David Szabo (Senior Associate Consultant - Engineering) is a principal partner and owner of an oil and gas management consultancy specializing in asset evaluation, reserves progression, front end project appraisal, and organizational design. Mr. Szabo has over 36 years. experience in engineering, management and executive leadership in major integrated oil and gas companies including BP, TNK-BP, and Marathon, as well as extensive US and international experience in Russia and the FSU, West Africa Angola offshore, Middle East Kuwait, North Sea, Canada, Alaska, and the Gulf of Mexico Shelf and Deepwater.


Mr. Kevin Turco (Senior Associate Consultant - Geoscience) has over 33 years petroleum industry experience with an ongoing emphasis on integrated reservoir studies. He has been a proven and insightful contributor in all geologic aspects of reservoir studies including mapping, geocellular modeling, volumetric and reserve studies, depletion planning, well planning and operations, field surveillance, risk analysis, and core studies. His experience and training is with two international operators and positions include geologist, petrophysicist, geocellular modeler, operations, and various leadership positions. He has considerable experience in both clastic and carbonate reservoirs in the Shelf and Deepwater Gulf of Mexico, Permian Basin (TX-NM), East Texas, Gulf Coast, Gulf of Suez (Egypt), Llanos Basin in Colombia, Alaska North Slope, Canadian Tar Sands, and the West Siberian Basin.


Ms. Welker-Haddock (Senior Associate Consultant - Geoscience) is a proven oil finder in multiple US and international arenas, including 7 years of expatriate experience. Experienced in all phases of exploration, appraisal and field development including 3-D geo-cellular modeling. She has broad technical knowledge and workstation skills, project management experience, strong presenter to management, partners and host governments.