John brings 43 years of experience in petrophysical and petroleum engineering studies. His specialties include: exploration, appraisal and development in shaly clastic reservoirs and complex carbonates; unconventional resources including coalbed methane, tight gas, shale reservoirs, and heavy oil; enhanced oil recovery; property valuation for mergers and acquisitions; lease sale preparation; log-seismic interrelationships; mentoring of client staff for NOC's and IOC's; external technical peer reviews.

John is a recognized authority in the identification and evaluation of low resistivity, low contrast (LRLC) pay zones and has presented courses/seminars worldwide over the last 25 years. He also co-teaches several geo-science/engineering courses with other industry experts. He is an expert witness at the Texas Railroad Commission and other judicial courts. John is the author and editor of numerous publications and technical poster presentations. He has generated, sold and successfully drilled prospects throughout the Texas Gulf Coast.


B.S. Petroleum Engineering, University of Pittsburgh, 1973, Magna cum Laude
M.S. Petroleum Engineering, University of Houston, 1994, Magna cum Laude
Shell Oil Companies, 1973-1980; Senior Petrophysical Engineer
Loren and Associates, Inc., 1980-1998; Senior Petrophysical Consultant
Petrophysical Consultant; 1998-Current


Society of Petroleum Engineers-1971
American Association of Petroleum Geologists-1999
Society of Petrophysicists and Well Log Analysts-1980
Houston Geological Society-1983


Afren Resources USA, Inc.: Nigeria, Republic of South Africa, Kenya
Blackhorse Energy, LLC: Louisiana
Coastal Energy Company: Thailand, onshore and offshore
Collarini Energy Staffing, Inc.; Domestic and International
Endeavor Natural Gas, LP: Texas
Halcon Operating Company, Inc.: Texas
Hyperdynamics Corporation: West Africa
Matagorda Energy Company, LLC: Offshore Texas
Matrix Petroleum, LLC: Texas
MidCon Energy Partners, LP: Oklahoma
Midstates Petroleum Company, LLC: Oklahoma
Multifuels, LP: Louisiana
Noble Energy: Deepwater Gulf of Mexico
PGH Engineers: Texas, California
PTTC Rocky Mountain Region: Teaching
PanAtlantic Exploration: Offshore Brazil, West Africa, Romania, Colombia
Pinnacle Potash International, LTD.: New Mexico
RPS Group (Scotia): International
RPS Group (NautilusWorld LTD): Teaching
Sanchez Oil & Gas Corporation: Texas
Shell Oil Company: Domestic, International, Deep Water Gulf of Mexico
Subsurface Consultants & Associates, LLC: Domestic and International
Torrenco Energy, Inc: Mexico