G&W Engineering is a small business that produces BIG results. Established in 1992, by principals Kevin Griesemer and Mike Williams, the company has grown to become one of the best Engineering Firms in the Midwest. Our "WHOLE BUILDING" approach applies our vast experience to the facility as a whole, rather than individual systems. It is when everything is working together that you achieve sustainable results.

Kevin Griesemer
Founder & Principal

Kevin has over 30 years of diverse experience in the Mechanical, Electrical and Plumbing engineering fields. He possesses deep construction experience with system installation and commissioning. He is the past president of the Central Chapter of the Building Commissioning Association (BCA).

At G&W, Kevin guides the company in a direction that leads the employees, projects, and clients towards success. His leadership has helped G&W become one of the most trusted engineering firms in the Midwest.

He and his wife have four young children that keep him busy outside of the office.

Mike Williams
Founder & Principal

Mike has a broad experience in Mechanical, Electrical and Plumbing systems with over 35 years of experience. He has a keen understanding of the construction process and ensures that all of G&W's design documents take constructability into consideration.

Mike oversees and self-performs much of the stringent Quality Control process at G&W. His vast experience and attention to detail help us maintain the high quality documents that our clients expect from G&W Engineering.

He is also an avid skier and loves to hit the powder in Salt Lake City, Utah every winter.

We at G&W hold ourselves to high standards of excellence and our work, backed by deep industry experience and dynamic thinking, achieves sustainable, high quality results.  Our principals have a hands-on policy and are consistently involved in every aspect of contract documentation and engineering decisions.  With all disciplines located in our St. Louis headquarters and our national exposure, we ensure high quality and efficient project management.

Our firm-wide objective is to produce the highest quality results and consequently we insist that our contract documents be clear, concise, thorough and professional in appearance. Our belief is that accuracy and thorough documentation translate to accurate estimating and clarity of scope for the construction team. G&W produces contract documents with industry standard AutoCAD, REVIT, and BIM software.

Our approach is simple but hugely effective - capitalize on our vast, collective industry experience to produce superior construction documents that best serve our clients and achieve the maximum return on their investment.​


Our promise is to listen to your needs and utilize our proven process to provide timely solutions that meet your objectives and help you succeed in your mission. 


“We have been fortunate to continue growing G&W Engineering even through some of the toughest economic times in our country. Through hard work and a loyal following of our best clients, we continue to grow by adding services and expanding our regional coverage. We now have 3 office locations and are registered in over 40 states. Thanks to all of our clients for contributing to our success!" 

Kevin Griesemer, Principal at G&W Engineering

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