Gregory Donald Croft

Dr. Gregory Croft photo


School of Science » Environmental and Earth Science
SMC Email Address: 
Contact Information: 

Brousseau Hall - 102

Phone: 5102767961

Curriculum Vitae: 


  • Doctor of Philosophy Civil Engineering, University of California at Berkeley, December 2009
    Dissertation: Resource Limits and Conversion Efficiency with Implications for Climate Change
  • Master of Science Geophysics, Stanford University, January 1983
    My research topic was the use of 2-dimensional filters in the Fourrier domain to suppress coherent seismic noise in the Val Verde Basin of West Texas
  • Bachelor of Art Geology, University of California at Santa Barbara, June 1981
    Outstanding Senior Award

Professional Experience

Professional Experience:

  • Principal - Greg Croft Inc. (November 2000 - Present)
    I have an oil and gas exploration consulting business.
  • Executive Vice President - Harrods Energy Thailand Limited (March 1998 - October 2000)
    I managed an oil and gas exploration program in the Gulf of Thailand. Our discoveries now belong to Pacific East Asia Resources Limited.
  • Staff Geophysicist - Chevron Overseas Petroleum (February 1983 - October 1994)
    I worked in a number of positions in South America, West Africa and Corporate Staff

Teaching Experience:

  • Lecturer - Saint Mary's College Environmental and Earth Science (February 2010 - Present)
    I teach Historical Geology (EES 50), Physical Geology (EES 40) and January Term classes on Petroleum Geology and Gem Minerals.

Courses Taught

Recently Taught:

  • Oceanography (BIO-55)
  • The Future of Transportation (JAN)
  • Petroleum Geology (JAN)

Regularly Taught:

  • Earth History (EES-50)
  • Geology and the Earth (EES-40)
  • Gem Minerals (JAN)


Sacramento Petroleum Association

California Shales and Other US Shale Plays - Sacramento Petroleum Association April meeting - In spite of early high hopes and much effort, large-scale oil and gas production from shales has not happened in California. This presentation looks at the geological differences between major shale plays in other states and California's Monterey and Kreyenhagen formations. (April 18, 2018)

Commonwealth Club

Keystone XL Pipeline Panel
Commonwealth Club Forum on Keystone XL Pipeline
I was one member of a five-person panel discussing the environmental issues surrounding the Keystone XL pipeline
(April 26, 2013)

UC Berkeley Civil Engineering

Hydraulic Fracturing and Groundwater Contamination. Croft, Gregory 
Civil Engineering Seminar, UC Berkeley (April 2013)
This presentation describes the process of hydraulic fracturing, the risks to groundwater, and measures to minimize those risks


  • Croft, Gregory and Patzek, Tadeusz. "A Global Coal Production Forecast with Multi-Hubbert Cycle Analysis." Energy 35.8 (2010): 3109
  • Croft, Gregory and Patzek, Tadeusz. "Potential for Coal-to-Liquids Conversion in the U.S.-Resource Base ." Natural Resources Research 18.3 (2009): 173
  • Croft, Gregory and Patzek, Tadeusz. "Potential for Coal-to-Liquids Conversion in the United States: Fischer-Tropsch Synthesis ." Natural Resources Research 18.3 (2009)


Scholarly Interests: 


  • Earth Science

    My recent research topic is the availability of coal resources, how the methodology of reserve estimation for coal is flawed, and how there is not enough mineable coal to generate the carbon emissions in the scenarios developed by the Intergovernmental Panel on Climate Change.