Business Details
50+ Years
experience
Trusted Structural & Geotechnical Engineering Solutions
Founded in 1968, Carl Jahn & Associates, LLP has dedicated over five decades to delivering structural and geotechnical engineering solutions. Our team of seasoned professionals, with an average of 25 years of experience, has successfully completed more than 8,000 projects nationwide. We specialize in providing tailored engineering services for both large-scale and small projects, prioritizing innovative design and technical excellence. Our commitment to client satisfaction is reflected in our 95% repeat client rate and over 30 awards for design excellence. We approach each project with a focus on solving complex engineering challenges through detailed analysis and alternative framing solutions.Our expertise spans geotechnical investigations, structural design, building envelope assessments, and forensic engineering. We serve architects, developers, contractors, and governmental agencies, offering comprehensive services from concept to construction. Our engineers hold licenses across multiple states and maintain affiliations with leading industry organizations. We emphasize collaboration, technical rigor, and adherence to the highest professional standards. With a legacy built on trust and reliability, we continue to deliver engineering solutions that meet the evolving needs of our clients.
Services
Geotechnical Engineering
Structural Engineering
Building Envelope
Forensic Engineering
Foundation Engineering
Construction Dewatering
Earth Retention Engineering
Building Condition Surveys
Expert Testimony
Peer Review
Details
- Year established: 1968
Highlights and features
- We have over 50 years of specialized engineering experience
- Our staff maintains an average of 25 years industry expertise
- We have successfully completed more than 8,000 diverse projects
- We hold 30+ awards for engineering design excellence
- We serve clients across multiple sectors nationwide
Services
Geotechnical Engineering
Our geotechnical engineering services address complex subsurface challenges through foundation design, soil improvement, and geotechnical investigations. We provide comprehensive solutions for groundwater control, earth retention, and seismic evaluations. Our expertise ensures stable, cost-effective foundations for diverse construction projects.
Structural Engineering
We deliver structural design solutions for new and existing buildings using steel, concrete, wood, and masonry materials. Our services include vibration control, equipment foundations, and structural analysis of building envelopes. We specialize in innovative framing solutions for complex construction challenges.
Forensic Engineering
Our forensic engineering team investigates structural failures and distress conditions using advanced techniques like laser scanning and material testing. We provide expert analysis for building envelope systems, offering rehabilitation solutions and litigation support for construction-related disputes.
Building Envelope
We specialize in building envelope condition assessments, failure analysis, and design development. Our services include thermographic testing, water resistance evaluations, and structural load analysis for cladding systems. We provide comprehensive solutions for both new construction and envelope rehabilitation projects.
Expert Testimony
Our licensed engineers provide expert testimony and litigation support for construction disputes. We offer technical analysis, peer review services, and forensic investigations to support legal proceedings involving structural failures, construction defects, and engineering standards compliance.
People
Robert Cosselman
Partner, Structural Engineer
With over 35 years of experience, Robert Cosselman leads structural engineering projects. Licensed in multiple states, he specializes in concrete and steel construction, holding memberships in leading engineering organizations.
Matthew McKee
Partner, Structural Engineer
Matthew McKee brings 17 years of structural engineering expertise. Licensed in seven states, he focuses on innovative structural solutions for complex building systems and construction challenges.
Erik Nelson
Partner, Structural Engineer
Erik Nelson contributes 16 years of structural engineering experience. Licensed in eight states, he specializes in advanced structural analysis and design for commercial and industrial projects.
Jason Thorpe
Partner, Geotechnical Engineer
Jason Thorpe offers 20 years of geotechnical engineering expertise. With dual master's degrees, he specializes in foundation design and subsurface solutions for complex construction projects.
Brent VanHatten
Associate Partner, Structural Engineer
Brent VanHatten provides structural engineering solutions with specialized expertise in building systems. Licensed in New York, he contributes to diverse projects requiring technical precision and innovative design.
Questions
What engineering services do you offer?
We provide structural engineering, geotechnical engineering, forensic analysis, building envelope assessments, and expert testimony services for commercial, industrial, and institutional projects.
How long have you been in business?
John P. Stopen Engineering has provided engineering services since 1968, with over 50 years of combined experience among our senior staff.
What project sizes do you handle?
We work on projects ranging from small renovations to large-scale developments with construction budgets up to $250 million.
Do you work outside New York State?
Yes, while based in Syracuse, NY, we serve clients across the United States for various engineering projects.
What makes your firm different?
Our firm combines 50+ years of experience with technical innovation, holding 30+ design awards and maintaining a 95% client retention rate.
How do you handle complex engineering challenges?
We employ advanced analysis techniques and alternative framing solutions to solve complex problems, supported by our team's extensive experience across diverse project types.
