About MacKay & Somps

Few engineering firms can match our longevity and track record in California.  Founded in 1953 by Donald MacKay and George Somps, the firm helped drive the spectacular growth occurring 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, cost effectively, and on time.


Mark McClellan, P.E.


Paul R. Hart, P.E., QSD/QSP


Chris Ragan, P.E.



Roseville, CA

Donna Pasquantonio, ASLA, LEED AP

Operations Manager, Planning Manager,
& Associate Principal

Steve Smith, P.E.

Chief Engineering Manager & Associate Principal

Jennifer Lane, P.E.

Assistant Operations Manager
& Engineering Manager

Holger Fuerst, P.E.

Engineering Manager

Pleasanton, CA

Chris Ragan, P.E.

Operations Manager & Principal

Chris Guenther, P.E.

Assistant Operations Manager
& Engineering Manager

Bob LaShells, P.E.

Associate Principal

Ian MacDonald, L.S.

Survey Manager

Administrative Services

Jennifer Yokel

Operations Manager