Over Seven Decades of Engineering Excellence

Over Seven Decades of Engineering Excellence

LSW Engineers Arizona, Incorporated and LSW Engineers California, Incorporated (formerly Lowry-Sorensen-Willcoxson Engineers, Inc.) is a consulting engineering firm specializing in the design of mechanical, plumbing, electrical, and technology systems for built environments.


The company was formed in 1947 as a privately owned firm. In 1953, Lowry and Sorensen Engineers was organized as a partnership, with the firm operating as a corporation since 1961. A California Corporation was founded in San Diego in 1977 and both companies underwent a name change in 2000.

LSW has performed engineering services for more than 18,000 projects and offers the full complement of mechanical, plumbing, electrical, and technology consulting services. We are prepared to provide all necessary services to help define the scope, then complete your project on time and within your budget.



Our mission is to lead our profession with innovative designs that are consistent with sound engineering. We actively promote professional and individual growth, recognition, and compensation within a healthy and stable work environment. Through a dedicated team effort, we provide quality work and exemplary service put forth with pride, integrity and professionalism.


The Team

Our project teams are comprised of individuals with pertinent experience for each project. Assigned teams are supported by our staff of registered mechanical and electrical engineers, designers, CAD specialists and administrative personnel. Our staff size assures that key personnel assigned to each project will be free from other responsibilities, thereby providing the time commitment needed for each project to assure its successful completion.


         President -Arizona          Senior Vice President - Arizona

     Lance A. Jones, P.E.                 James H. D'Andrea, P.E.

Engineering Staff

Adam J. Bagby, P.E., Vice President, AZ
Erica Billings, P.E., AZ
Justin M. Holmes, P.E., LEED AP, Vice President, AZ
Gerald E. Katafiasz, P.E., RCDD, Vice President, AZ
Cory Killpack, P.E., Vice President, AZ
Darrel Miller, P.E., Vice President, AZ
Philip J. Mouw, P.E., LEED AP, Vice President, AZ
Mark D. Ralston, P.E., LEED AP, Vice President, AZ
Samatha Robinovitz, P.E., Vice President, AZ
Joshua P. Shore, P.E., Vice President, AZ
Emily Spencer, P.E., AZ
Rick D'Andrea, P.E., AZ
Chris Doan, P.E., AZ
Josh Espericueta, P.E., AZ



Staying up to date and involved with the ever changing technology in our industry is important to LSW. Many of our staff are not only active members in good standing, but have been officers in the following professional organizations:

AAED (Arizona Association for Economic Development)
ACCA (Air Conditioning Contractors of America)
ACEC (American Council of Engineering Companies)
ACEC/AZ (American Council of Engineering Companies-AZ)
ASHRAE (American Society of Heating, Refrigeration, and Air Conditioning Engineers)
ASPE (American Society of Plumbing Engineers)
BICSI – A Telecommunication Association
CASHE (Central AZ Society of Healthcare Engineers)
ICC (International Code Council)
IEEE (Institute of Electrical and Electronics Engineers)
IESNA (Illuminating Engineering Society of North America)
NFPA (National Fire Protection Association)
SAME (Society of American Military Engineers)
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