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WKA Principals


David R. Gius Jr., MS, PE, GE, PG, CEG

President and Principal Engineer

Mr. Gius has over 30 years of experience as a project engineer, dating to his entry into the fields of geotechnical engineering and engineering geology in 1985. His extensive track record includes geotechnical and geologic studies for schools, hospitals, fire stations, commercial and industrial projects, and residential subdivisions. Mr. Gius has performed numerous site-specific ground response studies for earthquake analyses of structures, as well as forensic analyses of distressed structures throughout the Sacramento Valley.

Mr. Gius received his Bachelor of Science degree in Geology and Master of Science degree in Civil Engineering from San Jose State University. His studies concentrated on the fields of engineering geology, geotechnical engineering and open-channel hydraulics. He is a California registered Civil Engineer, registered Geotechnial Engineer, Professional Geologist and a Certified Engineering Geologist. Mr. Gius is a member of the American Society of Civil Engineers, the Association of Engineering Geologists, the Earthquake Engineering Research Institute and the Structural Engineers Association of Central California, and is past President of the California Geotechnical Engineering Association – CalGeo (1999–2000). Mr. Gius is a proud member and Past President (2015-2016) of the Rotary Club of West Sacramento, Centennial. 

Professional Registrations

Civil Engineer CE 49098
Geotechnial Engineer GE 2318 
Professional Geologist PG 5272
Certified Engineering Geologist CEG 1681






Andrew S. Wallace

Chief Financial Officer and Chief Operating Officer

Mr. Wallace began working for WKA in 1985 while attending California State University, Chico, where he received his Bachelor’s degree in Business and Health Care Management. He rejoined the firm in 1995 as the company's Controller and Operations Manager. In 2000, he became WKA’s Chief Financial Officer and Vice President of Operations.

Mr. Wallace's professional and civic affiliations include serving on the Board of Directors of Presidio Insurance Company LTD and on the Board of Directors of the West Sacramento Chamber of Commerce, for which he served as President in 2007. He is a Board Member and Past President of the Rotary Club of West Sacramento and serves on the Board of Directors for the West Sacramento Rotary Foundation. He is a School Board Member and Co-Founder of the Delta Elementary Charter School, and the Chief Financial Officer for the Friends of Clarksburg Schools Inc. Foundation. In 2010, Mr. Wallace was awarded the West Sacramento Business Person of the Year by the Chamber of Commerce.