about pwi

Who We Are

PWI Engineering was established in 1936 as Pennell & Wiltberger, Inc., and has evolved into a professional full-service facilities expert. With over 85 years of continuous practice, we offer a full range of mechanical, electrical, plumbing, and life safety/fire protection design and consulting services for various clients and projects.

We continue to broaden our level of expertise with our Power Designs for Combined Heat and Power and Central Utility Plants. Our engineers provide feasibility studies, modeling, design, and incentives / financial management for your project.

Our client retention over the past twenty years is approximately 90%. We believe that the key to our ability to build long-term professional relationships is our passion to provide expertise in engineering and proven results.

meet Our Leaders


Our successes are due not only to a knowledge-based staff but to the leadership and dedication of our Principals and Directors.

Principal, Electrical Director

Principal, Controller

HVAC Director

William O’Donnell, CPD

Plumbing Director

Marc Pisarek, CPD

Associate Plumbing Engineer