Geotechnical Engineering



Having over 30 years of experience as an educator, researcher, consultant and practitioner.

Welcome to my official website!

I have decided to create this site to provide information about Cone Penetration Testing (CPT) and liquefaction to practicing engineers and geologists.


I have included all my technical papers here for reference as well as my Robertson’s Remarks and other informal information about cone penetration testing. Enjoy!


I currently work as a Technical Advisor for Gregg Drilling & Testing, Inc in Southern California. I oversee the quality assurance and quality control procedures for Gregg’s CPT operations as well as help with R&D efforts on our equipment design and manufacturing.


I was also involved in the creation of a number of inexpensive software programs available for engineers to interpret CPT data, along with John Ioannides, a talented geotechnical engineer and software programmer in Greece.

We came up with a program for CPT Interpretation called CPeT-IT as well as one for liquefaction evaluation called CLiq (pron. “Slick”).

I frequently use these programs to help answer technical questions or solve design issues using CPT data. I recommend visiting the website of the software company, GeoLogismiki.


I continue to consult on projects and often travel internationally for conferences or speaking engagements.


I wanted to make available most of my papers and publications to the engineering community. Please feel free to download these papers and use them for your own reference or research.


News Board

I will be attending CPT’18 in Delft, The Netherlands June 21-22, 2018. Check out the website for information and how to register. Looking forward to […]

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I was honored to be awarded the prestigious Seed Medal at IFCEE 2015 in San Antonio, Texas this year. Along with this honor, I was […]

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I’ve just revised and updated my Guide to Cone Penetration Testing which is now in its 6th edition. Visit my publications page or look for […]

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