Pickering, Corts & Summerson (PCS) delivers award winning multi-discipline civil engineering services from our four office locations in Pennsylvania and New Jersey.

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ASHE East Penn 2024 Project of the Year over $20 Million: SR 0078, Section 12M, Berks County, PA, PennDOT District 5-0
Structural Engineering -
SR 4003 (Kernsville Road), Section 01B, over Jordan Creek, PennDOT District 5-0
Structural Engineering -
Mill Street Wharf Bucks County, PA
Site Development -
Inspection of Bridges in Philadelphia, PennDOT District 6-0
Bridge Inspection -
Decade of Investment Bridge Preservation Projects, Open-End Design, PennDOT District 8-0
Structural Engineering -
Villas at Newtown, 179 Residential Homes, Bucks County, PA
Site Development -
Main Street over Tributary to Neshaminy Creek, Bucks County, PA
Structural Engineering -
SR 4069, Section 01B Lehnenberg Road, PennDOT District 6-0
Structural Engineering -
SR 0080, Section 10S Monroe County, PennDOT District 5-0
Highway Engineering -
Underwater Bridge Safety Inspections for the Cape May County Bridge Commission
Underwater Inspection -
Mayburg Bridge Repair-Design and Engineering Services, Allegheny National Forest
Structural Engineering -
Inspection and Load Rating of 240 State-Owned Bridges, PennDOT District 8-0
Bridge Inspection
Our Services
- Bridge Inspection
- Underwater Inspection
- Structural Engineering
- Highway Engineering
- Site Development
- Land Surveying

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PCS Spotlight - Underwater Inspections
Feb 21 -
Open Role - Accounting Associate
Newtown, PA -
Blog - Inspection of National Park Trail Bridges: Federal Highway Administration, Eastern Federal Lands Highway Division
Jan 31 -
Blog - John Ziemblicki, P.E. Promoted to Vice President
Jan 23 -
New
Open Role - Bridge Inspection Team Leader (PA)
Cranberry, PA -
New
Open Role - Bridge Inspection Team Leader (NJ)
Ewing, NJ -
New
Open Role - Entry-Level Engineer / Bridge Inspector (Cranberry)
Cranberry, PA -
New
Open Role - Entry-Level Engineer / Bridge Inspector (Ewing)
Ewing, NJ -
New
Open Role - Transportation Design Project Engineer
Newtown, PA -
Blog - Paul Klemunes, P.E. Promoted to Vice President
Nov 14 -
New
Open Role - Bridge Inspection Team Leader (PA)
Camp Hill, PA -
New
Blog - Mark Bredl, P.E., Former PennDOT District 1-0 Assistant Bridge Engineer, Joins PCS
Mar 8 -
New
Blog - Kamlesh Ashar, P.E., Former PennDOT District 5-0 Bridge Engineer, Joins PCS
Jun 1 -
Blog - PCS Get to Know: Christopher Wells
Mar 25 -
New
Open Role - Entry-Level Engineer / Bridge Inspector (Newtown)
Newtown, PA -
New
Open Role - Entry-Level Engineer / Bridge Inspector (Phillipsburg)
Phillipsburg, NJ -
Blog - PCS Performs Underwater Bridge Inspections for DRJTBC
Dec 3 -
Blog - PCS Completes Post-Hurricane Ida Flood Inspections for PennDOT
Oct 18 -
Blog - PCS Receives 39th Annual Road/Bridge Safety Improvement Award for Yost Road Bridge Project
Oct 8 -
Blog - PCS Get to Know: Cindy Vergara
Sep 24 -
Blog - PCS Get to Know: Liz Bocskay
Jun 18 -
Blog - PCS Examines I-95 Bridge After Emergency Shutdown
May 28 -
Blog - PCS Wins 2021-2022 General Engineering Contract for DRJTBC
May 21 -
Blog - PCS Get to Know: Phil Mosby, P.L.S.
Apr 9 -
Blog - PCS Get to Know: Tyler Quill
Feb 11 -
New
Open Role - Bridge Inspection Team Leader (PA)
Newtown, PA -
Blog - Yost Road over Stony Brook Tributary, Whitpain Township, Montgomery County
Oct 19 -
Blog - PCS Wins Bridge Engineering Project with the PA DCNR
Sep 18 -
Blog - PCS Get to Know: Jenna Herbst, P.E.
Sep 11 -
Blog - PCS Performs Hydrographic Survey in Philadelphia
Sep 3 -
Blog - PCS Performs Post Flood Bridge Inspections
Aug 14 -
Blog - PCS Inspectors Perform Emergency Inspection of the Vine Street Bridge In Philadelphia
Aug 7 -
Blog - PCS Get to Know: Ted Tuz, P.E.
Jul 17 -
Paul Klemunes is a Bridge Inspection Project Manager & Project Engineer. He also manages PCS' Harrisburg, PA office. - PCS Get to Know: Paul Klemunes, P.E.
Jun 5 -
Blog - PCS Get to Know: Aaron Detwiler, P.E.
Apr 17 -
Blog - Jim White Promoted to Chief Operating Officer at PCS
Jan 29 -
Blog - PCS Wins Inspection Project With PennDOT
Dec 2 -
- James S. White, Jr.
Presidentview bioJames S. White, Jr.
PresidentJames S. White, Jr. serves as President of Pickering, Corts & Summerson, overseeing the day-to-day administrative and operational functions of the company. Jim has been with PCS for over 34 years and is a member of our Board of Directors. He is a PennDOT Certified Bridge Safety Inspector and is responsible for the administration of all National Bridge Inspection Standards (NBIS) Inspection and Underwater Inspection Agreements.
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- John C. Wilhelm, PE
Executive Vice Presidentview bioJohn C. Wilhelm, PE
Executive Vice PresidentJohn C. Wilhelm, PE joined Pickering, Corts & Summerson in 1990 and currently serves as Executive Vice President. John is involved in all aspects of the firm, serving as Quality Control Manager on all projects, and has over 38 years of experience in the structural design and inspection of bridges. He is a graduate of Drexel University with a B.S. in Civil Engineering and is a registered Professional Engineer in Pennsylvania, New Jersey, Delaware, Maryland, New York, and West Virginia. John is an active member of the American Society of Civil Engineers (ASCE) and the American Society of Highway Engineers (ASHE).
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- Aaron S. Detwiler, PE
Executive Vice Presidentview bioAaron S. Detwiler, PE
Executive Vice PresidentAaron Detwiler, PE joined Pickering, Corts & Summerson in 2007 and serves as Executive Vice President and Bridge Inspection Project Manager. He has inspected well over 2,000 structures for PennDOT, NJDOT, USFS, DCNR and various Local Owners including the In-Depth inspections and Load Ratings of some of the region’s most complex structures. As a Project Manager, he has overseen various projects for PennDOT, NJDOT, PA DCNR, and the USDA Forest Service consisting of Bridge Inspections (Routine/In-Depth), Load Ratings, Emergency Repairs, and Rehabilitations / Replacements. Aaron has managed PCS’ Phillipsburg, NJ office since 2013.
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- Paul Klemunes, PE
Vice Presidentview bioPaul Klemunes, PE
Vice PresidentPaul Klemunes, P.E. joined Pickering, Corts & Summerson in 2017 and serves as Vice President and Project Manager for both design and inspection projects. His extensive structural experience includes the preservation, rehabilitation, replacement, and inspection of bridges. Paul graduated from Pennsylvania State University with a Bachelor of Science in Civil Engineering and is a licensed engineer in Pennsylvania, Connecticut, Maryland, New York, Virginia, and West Virginia.
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- John P. Ziemblicki, PE
Vice Presidentview bioJohn P. Ziemblicki, PE
Vice PresidentJohn Ziemblicki, P.E. joined Pickering, Corts & Summerson in 2009 and serves as Vice President and Structural Design Project Manager. He has extensive experience in performing and managing bridge replacement, rehabilitation, and NBIS inspection projects in Pennsylvania and New Jersey. John is a graduate of Drexel University with a Bachelor of Science in Architectural Engineering – Structural Concentration and a licensed engineer in Pennsylvania, New Jersey, and Delaware.
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- Mark A. Havers, PE
Vice Presidentview bioMark A. Havers, PE
Vice PresidentMark A. Havers, PE joined Pickering, Corts & Summerson in 2002 and serves as Vice President and Manager of Site Engineering. Mark is a graduate of the University of Pittsburgh with a B.S. in Civil Engineering Technology, and Pennsylvania State University with a B.S. in Landscape Contracting. He is a registered Professional Engineer in Pennsylvania, New Jersey, Maryland, and West Virginia. Mark has been a PCS Board Member for over a 15 years.
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- Richard H. Stanger, PE
Vice Presidentview bioRichard H. Stanger, PE
Vice PresidentRichard H. Stanger, PE has been with Pickering, Corts & Summerson for over 32 years and serves as Manager of Transportation Design. Rick oversees the firm’s technical disciplines of structural design and highway engineering. He is a graduate of Pennsylvania State University with a B.S. in Civil Engineering and is a registered Professional Engineer in Pennsylvania, New Jersey, New York, and West Virginia. Rick has been a member of the PCS Board of Directors for over 17 years.
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