Our skilled team offers a diverse level of expertise that allows us to work through challenges and provide a “complete package” for any given project. We embrace collaboration among ourselves as well as with our clients to maximize project success.



McMillen Sr.,

P.E., P.L.S.

Founder &

Board of Directors

Terry founded McMillen Engineering Inc. in 1977.  He graduated from West Virginia University, where he earned a Bachelor of Science Degree in Civil Engineering.


Terry is a Registered Professional Engineer and a Registered Land Surveyor.

A past president of the Pennsylvania Society of Professional Engineers-Fayette Chapter, Terry was also the organization’s secretary-treasurer. 

He is also a member of the American Society of Civil Engineers, National Society of Professional Engineers and Pennsylvania Society of Land Surveyors.


McMillen Jr.,



Terry E. McMillen, Jr., PLS, President, received an Associate Degree in Engineering Technology from Penn State-Wilkes Barre Campus. He is a Registered Professional Land Surveyor and is responsible for all survey projects. Terry started his career with McMillen Engineering Inc.  in 1986 as a part-time surveyor. In 1994, he was promoted to a survey party chief. In January 2009, was promoted to Vice President of Surveys. In January 2013, Terry was promoted to Vice President. In April 2020, Terry was promoted to President. He currently serves dual roles as President and Chief of Surveys.

Terry is a member of the Pennsylvania Society of Land Surveyors, on the Executive Committee of the Pennsylvania Society of Land Surveyors, and the National Society of Professional Surveyors (NSPS). He was awarded with the Distinguished Service Award by the Pennsylvania Society of Land Surveyors.  He was Honorably Discharged from the United States Marine Corp.




Vice President 

Jim began his professional career at McMillen Engineering Inc. in 1996.  He was promoted to Vice President of Engineering in 2009, then promoted to his current position of Vice President in April of 2020.


He received a Bachelor of Science Degree in Structural Design and Construction Engineering Technology and an Associate Degree in Architectural Engineering Technology from Pennsylvania State University. Jim is a Registered Professional Engineer.

Tammy Stenson,

A.I.C.P., B.C.O.

Senior Project Planner

Tammy joined McMillen Engineering Inc. in 2007 as Senior Project Planner.

She earned a Bachelor of Science Degree in Political Science from St. Vincent College and a Master of Arts Degree in Regional Planning and Geography from California University of Pennsylvania. 


She is a member of the Pennsylvania Planners Association and the American Institute of Certified Planners.


Tammy is also a Certified Building Code Official. 

Professionalism and Integrity 

the foundation of our success




A key element is giving each client respect. Every project receives our undivided attention and commitment to providing sound engineering solutions by the application of basic civil engineering principles using state-of-the-art methods and materials.

This is accomplished in part by maintaining a continuous improvement program based upon continuing education and professional growth. Much of our success is based upon our long-time talented employees who keep current in their field of expertise, maintain licenses and certifications, and complete continuing education courses and seminars.

As active members of our community, we firmly believe in giving back and encourage our staff to be involved within their communities as well.  We are dedicated to our clients and to our community by providing quality design to achieve excellence.

115 Wayland Smith Drive, Uniontown, PA 15401          |          724.439.8110          |          info@mcmilleng.com

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