About People

Rex Whistler

Rex Whistler, PE

Senior Engineer

Rex joined the Portland office of Shannon & Wilson in January 2019, after previously working in the Seattle office since 2014. Rex received his BS in Geology from Portland State University and completed his Master’s of Geological Engineering at the Colorado School of Mines.  His technical experience encompasses geological site characterization, rock slope stability analysis, rock fall analysis, open pit and underground mine design, dam safety, and geotechnical report preparation. He has been involved in construction observation, including foundation subgrades, micro pile foundation installations, and rock bolt installation and testing. He has also been involved with subsurface field exploration and characterization in soil and rock, piezometers, and extensometers. 


  • MS, Geological Engineer, Colorado School of Mines, 2010
  • BS, Geology, Portland State University, 2007


  • Professional Engineer (Civil), Oregon


  • Association of Environmental and Engineering Geologists 

Practice Area

Geotechnical Services

Geological Services

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