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Group of McMillen Engineering, Inc. team in conference room discussing project


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 from within, as well as with our clients to maximize project success.

white silhouette of surveyor peering through GPS instrument
Terry Sr
corporate headshot of Terry McMillen, Sr.

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.

Terry McMillen Sr., P.E., P.L.S.
Founder & Board of Directors

Terry Jr

Terry E. McMillen, Jr., PLS, Owner/President, received an Associate Degree of 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 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 the Distinguished Service Award by the Pennsylvania Society of Land Surveyors.  He was Honorably Discharged from the United States Marine Corp.

Terry McMillen, Jr. dressed in suit and tie after receiving Surveyor of the Year award

Terry McMillen Jr., P.L.S.

corporate headshot of James Stanton

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.

James Stanton P.E.

Vice President

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. 


Tammy has several years of experience in interpreting and enforcing building codes and possesses in-depth knowledge of local, state, and national building codes. Her experience and expertise allows her to effectively review construction plans, conduct inspections, and issue permits.

She is a member of the Pennsylvania Planners Association and the American Institute of Certified Planners. She is also a Certified Building Code Official. 

corporate headshot of Tammy Stenson

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

Senior Project Planner


Professionalism and Integrity

The Foundation of Our Success

Providing sound engineering solutions through the application of basic civil engineering principles using state-of-the-art methods and materials.

Maintaining a continuous improvement program based upon continuing education and professional growth. 

Dedication to our clients and to our community by providing quality design to achieve excellence.

Group of professionals seated in conference room discussing upcoming projects

Our reputation endures because of our honesty with and respect for our clients. We take pride in our work and ensure that we’re executing needs-based, long-term solutions for our clients. Likewise, our clients turn to us for guidance on matters that require intense complexity and aggressive scheduling.

Our broad range of capabilities exists because of our team’s diverse areas of expertise, their skilled ability to collaborate with clients, and their dedication to our overall company objectives.  As a team, we’re committed to maintaining our core values – professionalism, integrity, precision, and loyalty – every day. We’re loyal to our clients and loyal to each other – that’s how we work, that’s how we succeed.

Visit our services page to review our capabilities, tell us about an upcoming project, or give us a call at 724.439.8110.

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