SEI’s clients have included:
Amman and Whitney, Inc.
Alfred Benesch & Company
Ang Associates, Inc.
U.S. Army Corps of Engineers
Delaware River Port Authority (DRPA)
Edwards & Kelcey, Inc.
Erdman Anthony, Inc.
Falls Township, Bucks County, Pennsylvania
Gannett Fleming, Inc.
Hardesty and Hanover, LLP
Intech Environmental Consulting, Inc.
Johnson, Mirmiran & Thompson, Inc.
P. Joseph Lehman, Inc.
Larson Design Group
Lichtenstein Consulting Engineers
Lower Bucks County Joint Municipal Authority
Mackin Engineering Company
McCormick Taylor, Inc.
Michael Baker Jr., Inc.
National Railroad Passenger Corporation (AMTRAK)
Parson Brinckerhoff, Inc.
Pennsylvania Department of Transportation (PennDOT)
Pennoni Associates Inc.
Philadelphia Regional Port Authority (PRPA)
Pickering, Corts & Summerson, Inc.
Prime AE Group, Inc.
Raytheon Infrastructure Services, Inc.
Tony Depaul & Son
Traffic Planning and Design, Inc.
Wilbur Smith Associates, Inc.