Susan Muha

Mariah Ehrhart, CPDT

Plumbing Systems CAD Technician

Mariah graduated from Somerset County Technology Center in 2013, where she studied Pre-Engineering/Drafting and Design. At SCTC she was also the school wide SkillsUSA President and the Western Region SkillsUSA Conference Vice President.

After graduating, Mariah went on to graduate from Pennsylvania Highlands Community College in 2015 with an AAS in Architectural and Civil CADD. She also made Deans List every semester, became a lifetime member of Phi Theta Kappa and Sigma Alpha Pi, and graduated with the honor of Magna Cum Laude.

Prior to being employed at East Hills Engineering Associates, she worked for three years as a structural designer in the construction industry. She is now working in EHEA’s Plumbing Department as a Plumbing Systems CAD Technician and passed the Certified Plumbing Design Technician (CPDT) exam in December of 2024.

When Mariah is not working, she likes hiking, reading, writing, and spending time with her family and friends.

You can contact Mariah at MariahE@easthillseng.com

Susan has over 25 years of drafting experience and has a BA from the University of Pittsburg at Johnstown.

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Mariah Ehrhart, CPDT

Mariah graduated from Somerset County Technology Center in 2013, where she studied Pre-Engineering/Drafting and Design. At SCTC she was also the school wide SkillsUSA President and the Western Region SkillsUSA Conference Vice President.

Jim Washko

Jim completed the Computer Programming Course at ICM School of Business in 1983 and has completed a various amount of drafting and design classes since then.

Michael Finnigan, CPD

Michael graduated from Forest Hills High School in 2006 where he received the Engineering Technology Award.

Bruce Chappell

Bruce brings more than 19 years of HVAC design experience in Healthcare, Commercial, Data Centers, Central Plants, Manufacturing and Historical Buildings.

Patrick Kishlock

Patrick brings his electrical and mechanical troubleshooting experience to our Team.

Cory Rozwat

Cory started his career at East Hills Engineering Associates as an electrical draftsman after graduating from Pennsylvania Highlands Community College in 2012 with an Associate degree in Applied Science.

Judi Lynch

Judi started her career in electrical design in 1977 working on commercial buildings.

Chris Mazzarese

Chris joined East Hills Engineering Associates in 2015 after graduating from Triangle Tech Greensburg with an Associates Degree in Mechanical Drafting and Design.

Rebecca Berkey

Rebecca brings business administration experience, marketing, creativity and an extensive customer relations background to the East Hills Team.

Susan Muha

Susan has over 25 years of drafting experience and has a BA from the University of Pittsburgh at Johnstown.

Kyle Koval, CHD

Kyle E. Koval is a 2010 graduate of Triangle Tech Institute, Greensburg, PA with an Associates of Applied Science in Architectural Computer Aided Drafting and Design.

George DeFrehn

In 1984, George DeFrehn and Gerald Kiniry founded East Hills Engineering Associates to provide Mechanical and Electrical Building System Design to Architects and Building Owners.

Chris Albright, PE, LEED AP

Christopher has a genuine interest in making things better and has engineered hundreds of HVAC systems since joining East Hills Engineering Associates in 2003.

Bryan Philips

Like many of Johnstown’s working-class Bryan began his working career in a local steel mill, where he eventually worked his way up to becoming a Turn Foreman at US Steel in the Johnstown Foundry Division before being laid off.

Barbara Hershberger

Brett Yonish, P.E., LEED AP

Brett graduated from the University of Pittsburgh at Johnstown with an Electrical Engineering Technology Degree, including a Math Minor and Physics Minor in 2006 and joined East Hills Engineering Associates days after graduation.