Principals

John W. Spiess, S.E. 
John graduated from Purdue University in 1970 with a Bachelor of Science degree in Civil Engineering.  He joined the firm in 1984, co-founded Ehlen & Spiess, Inc in 1994, and is now the President of the corporation.
Professional Registration in California:  Structural Engineer, Civil Engineer
Professional Affiliations:
  • Structural Engineers Association of Southern California Tri-Counties Chapter Director
  • California Office of Emergency Services Safety Assessment Program Volunteer
  • American Society of Civil Engineers Structural Engineering Institute
Jeffrey E. Haight, S.E. 
Jeff graduated from Cal Poly, San Luis Obispo in 1988 with a Bachelor of Science degree in Architectural Engineering.  He joined the firm in 1992, became a principal in 1999, and is the Vice-President of the corporation.
Professional Registration in California:  Structural Engineer, Civil Engineer
Professional Affiliations:
  • Structural Engineers Association of Southern California 
  • California Office of Emergency Services Safety Assessment Program Volunteer
    Deployed to St. Bernard Parish, LA after Hurricanes Katrina and Rita
  • American Institute of Steel Construction
Mark Crittenden,  S.E. 
Mark graduated from Cal Poly, San Luis Obispo in 1976 with a Bachelor of Science degree in Architectural Engineering.  He joined the firm in 2006 and became a principal in 2018.
 
Professional Registration in California:  Structural Engineer, Civil Engineer
 
  • Professional Affiliation
  • Structural Engineers Association of California
  • American Institute of Steel Construction
  • American Society of Civil Engineers- Structural Engineering Institute

Engineers

Aaron DeGough, C.E.
Gabe Sanchez, C.E. 
Jasper Jacobs, C.E.