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

Mark McClellan, P.E.
Mark Sauer, P.E.
Paul Hart
Paul Hart, P.E.
Chris Ragan, P.E.

Operations & Engineering Managers


Operations Manager & Principal  Paul Hart, P.E.

Chief Engineering Manager & Associate Principal  Steve Smith, P.E.

Assistant Operations Manager, Planning Manager & Associate Principal  Donna Pasquantonio, ASLA, LEED AP


Operations Manager & Principal  Chris Ragan, P.E.

Assistant Operations Manager & Engineering Manager  Chris Guenther, P.E.

Associate Principal  Bob LaShells, P.E.