Our Company

Few engineering firms can match our longevity and track record in California.  Founded in 1953 by Donald G. MacKay and George E. Somps, the firm helped drive the spectacular growth which occurred in the Santa Clara Valley after World War II, creating more subdivision lots in the San Francisco Bay region than all other engineering consultants combined.

Today’s leadership retains the same core business philosophies that make our company one of the largest and most successful private civil engineering firms in Northern California. MacKay & Somps delivers high quality service to home builders, land developers, and public agencies to get their projects built efficiently and cost effectively.

Executive Management Team

Ken Giberson, P.E., L.S.
Mark Sauer, P.E.
Mark McClellan, P.E.
Paul Hart
Paul Hart, P.E.
Larry Gomez

Operations & Engineering Managers


Operations Manager and Principal  Paul Hart, P.E.

Engineering Manager and Associate  Steve Smith, P.E.

Planning Manager  Donna Pasquantonio-Leslie ASLA, LEED AP


Operations Manager  Bob LaShells, P.E.

Engineering Manager and Associate  Chris Ragan, P.E.

Engineering Manager  Chris Guenther, P.E.