top of page


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.

Surveyor Man-white.png
Terry 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, 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., P.L.S.



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. 


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


Tammy is also a Certified Building Code Official. 

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.

bottom of page