​Happy Trails to Employee Number 1. 

Please join us in celebrating the retirement of Mark Welker, who is wrapping up an incredible 19-year career with Stahl Sheaffer Engineering and 41 years in the construction inspection industry!

Mark was instrumental in building and expanding Stahl Sheaffer’s construction inspection services. Drawing on his experience and industry roots, he helped us secure our very first PennDOT District 3-0 contract — a milestone that opened the door to countless opportunities with PennDOT, various municipalities, DCNR, Penn State University, and more.

Mark poured his heart into growing our company's growth and mentored countless former and current inspectors. We are so grateful to see what Mark will do in this next chapter. 

Thank you, Mark, for everything. Enjoy your retirement — you’ve earned it!  

​We are happy to welcome Robert Yanosky to the Stahl Sheaffer team! Rob holds a B.S. in Civil Engineering Technology from the University of Pittsburgh at Johnstown and an M.S. in Transportation Engineering from Villanova University. He is a licensed Professional Engineer in Pennsylvania and a certified Professional Traffic Operations Engineer (PTOE). With over 27 years of experience—primarily on PennDOT and Pennsylvania Turnpike projects—he’s excited about the growth potential of the Harrisburg office He will be part of our Transportation team under the supervision of Scott Popovich.