About Us

McMAHON ASSOCIATES, INC. (McMAHON) has provided professional engineering and architectural services to our valued customers for more than a century. Our team of over 150 professionals serve our clients from our corporate headquarters in Neenah, Wisconsin along with our Illinois and Indiana regional offices. We share the common goal of delivering our services s ‘The McMAHON Way’, meaning we strive to build long-term client relationships by combining strong core values with a culture for success. We do an extensive amount of work in the communities where we live and throughout the Midwest. But we have also provided professional services in locations spanning the United States, and even internationally.

Great emphasis is placed on adding value to all phases of a project. This “Value-Added” business philosophy, combined with our diverse design capabilities contribute to our solid history of repeat business. McMahon is also well-known for implementing sustainable design principles into our projects, including LEED® design standards, Lean practices, and waste-to-energy technologies.

The establishment of affiliate companies has allowed us to expand our capabilities as we have grown. Each company affiliated with McMahon complements the other. Our companies offer a broad spectrum of professional services, at a reasonable price, to meet the unique needs of our clients:

Engineering & Architecture:  McMahon Associates, Inc. (McMAHON) – Established 1909

Design/Build:  McMahon, Inc. – Established 1991

Public/Private Partnerships (P3):  Integrated Public Resources, LLC (IPR) – Established 2015

McMahon is a Top 500 Design Firm according to Engineering News Record (ENR).