Take Charge of Your Future

Join a team that gives you the support, resources, and autonomy to succeed.


For Problem Solvers, Creative Engineers, and Passionate People

GBA has a long history of helping green engineers and natural problem solvers build satisfying careers. We do that by taking the time to understand your goals and putting a team around you to propel them. If that sounds like the right environment for you, we’d love for you to grow with us.

Eli Zietlow, headshot

“GBA from top to bottom promotes an inclusive work environment where individual input is highly valued and long-lasting relationships are formed.”

Eli Zietlow, Mechanical Engineer

Two engineers examining plans

Our Difference

Protecting The Environment

One building at a time.

Founded on a simple premise — do great work while conserving the environments we work and live in — GBA has had a 50-year stretch of award-winning projects that help building owners operate at their best with sustainable systems.

Learn More About Our Commitment to Sustainability

Ben Mahrer, headshot

I’m challenged to learn and grow with each new project I work on.

“GBA provides a mature, yet playful, environment of professionals who want to help build each other up and provide the best service possible to every client we work with.”

Benjamin Mahrer, Electrical Engineer

Team members enjoying a social outing

Work/Life Balance

Sustainable Projects, Sustainable Lives

We know that work is not your whole life.

GBA is committed to progressive management policies that help our staff achieve balance. From competitive compensation and benefits packages to perks, social events, and volunteer opportunities, we support our team in living healthy, vibrant lives — on and off the job.

Engineer working on ductwork on ladder

innovating since 1973

Outstanding Service. Energy Efficiency. Creative Problem-Solving.

With foresight regarding the pressing need for energy conservation, our founder Dave Grumman started GBA with an unwavering dedication to helping building owners protect the environment while cutting building operating costs.

Decades later, that one-person firm has expanded to more than 100 energy efficiency experts and thousands of happy clients collaborating in projects that help preserve the planet.

Learn More About Our Start

One Team. Endless Capabilities.

We’re a family of passionate, diverse, and eco-conscious engineers who put the planet and people at the center of everything we do.

Meet Our Team


We’re Evolving. See How GBA is Pushing Sustainable Engineering Forward.

Explore the latest news, projects, and events at Grumman|Butkus Associates.

Discover What’s New For GBA

Key Weather Considerations for PV Design

Key Weather Considerations for PV Design

Electrical designers must be conscious of environmental factors that will impact electrical equipment, including temperature, wind, snow, and so on. This is especially critical for photovoltaic (PV) installations where a large portion of the system will be subjected...

Sustainability Report Featured on New GBA Site

Sustainability Report Featured on New GBA Site

The newly released 2022 GBA Sustainability Report is now available at GBA's recently launched, redesigned website. In 2013, the firm released its first annual corporate sustainability report. We recently completed the ninth edition, detailing our current scope of...

GBA Celebrates its 50th Anniversary

GBA Celebrates its 50th Anniversary

Grumman|Butkus Associates marked its 50th year in business on May 2, 2023. The company was incorporated on May 2, 1973, as Enercon, Ltd.: a one-person energy consulting firm based in Evanston, IL. Initial commissions consisted mainly of energy management studies,...