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Dane Seiler, PE


Dane Seiler first joined the CJW engineering team in December 2005 as an Engineer Intern. He has since become an integral part of the CJW team. Dane has experience in the area of transportation, traffic engineering, intelligent transportation systems, and project management. Project work Dane has completed includes geometric analysis, operational capacity analyses of signalized intersections, traffic studies, simulation modeling, pavement marking, signing, traffic control, and traffic signal design. While working for CJW, Dane has completed numerous Traffic Impact assessments. His computer experience includes Vissim, Synchro, Sidra, SimTraffic, Highway Capacity Software (HCS), and AutoCAD. 


Dane is also a part of the Missouri State University Cooperative Engineering Program – Instructor for Introduction to Transportation Engineering Lab.



C. Jay Wynn, PE, PTOE, LSIT

CEO and Owner

Jay Wynn is the CEO and owner of CJW Transportation Consultants.  He has over 30+ years of experience in civil engineering and land transportation planning and design. Jay opened CJW Transportation consultants in 2005 in an effort to fulfill a transportation engineering niche that he felt was lacking in the southwest Missouri region. Serving the area as a transportation consultant proved very successful and quickly allowed the company to expand into a full service civil engineering firm offering a complete spectrum of civil engineering solutions. Jay currently manages a staff of 20 and takes an active role in all his company’s projects. He believes in a “hands on” approach and is involved as the principal engineer on all projects. Jay’s typical responsibilities include serving as the client liaison, developing the scope of work, cost estimating, coordinating work with other entities both public and private, negotiating with state and local agencies, reviewing final plans and specifications, and construction management. Jay is also responsible for assisting his clients in the procurement of private and public funding sources such as Capital Improvement Programs, LPA processes, Grant acquisition such as Transportation Enhancement funding requirements, and NEPA.


Marc Thornsberry, PE

Senior Engineer - Client Liaison

Marc has extensive public sector engineering design and management experience in Missouri, including serving as Engineering Supervisor for the City of Jefferson City (15 years), Director of Public Works for Cole County, Missouri (7 years) and Director of Public Works for the City of Springfield (18+ years). Following his retirement from the City of Springfield, Marc served as the Safety & Mobility Engineer for the Federal Highway Administration, Missouri Division (7 years).   He was the Program Manager for the advancement and oversight of FHWA national highway safety and mobility programs and initiatives.

As a Senior Engineer - Client Liaison for CJW, Marc will be responsible for working directly with our clients to help manage projects, review plans, attend meetings, provide support and assistance to project teams, and collaborate with clients to identify and implement project goals.

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Chris Wynn, PE

Civil Engineer

Chris received a bachelor’s degree from the University of Missouri in Environmental Science in 2013 and a Civil Engineering degree from Missouri S&T in 2017. Prior to coming to CJW, Chris worked for Terracon Consulting Engineers as a Construction Materials Testing Specialist and as an Environmental Scientist. Chris is ACI and Asbestos certified. He has also gained experience working on civil site design, most recently for Dollar Tree Stores throughout the Midwest. In addition, Chris has experience in transportation design, traffic impact assessments, construction inspection, environmental inspection, and materials testing both on site and laboratory.

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Justin Orf, EI

Civil Engineer

Justin joined the CJW team as an intern in 2018, while attending school at Missouri State’s cooperative engineering program with Missouri S&T. Justin graduated with his bachelor's degree in civil engineering in May of 2019. Justin’s experience includes working with transportation systems analysis, micro simulation traffic modeling, master planning, utility coordination, signal timing, and the development of soil & erosion control plans. 

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Anthony Swanigan, EI

Civil Engineer

Anthony received a bachelor’s degree in civil engineering from Missouri S&T in December 2018.  Since joining CJW, Anthony has worked on transportation systems analysis, SWPPP document development, civil & site development plans, including site layout, grading, utility extensions, storm drainage, and soil & erosion control plans. 


Sawyer Posten, EI

Engineer Intern

Sawyer joined the CJW team as an intern in 2020 while attending school at
Missouri State's cooperative engineering program with Missouri S & T. He graduated with a
bachelor of science degree in civil engineering from Missouri S & T in May of 2022. Sawyer's work experience includes civil site design (site grading), sanitary sewers extensions, parking lots, utility services (gas, water, electric), and stormwater management.


Tawny Denzer

Graduate Engineer

Tawny received her bachelor’s degree in civil and environmental engineering from the University of Missouri in May 2022. She previously worked for the Missouri Department of Transportation before joining the CJW team. She worked for MoDOT in both the construction and traffic divisions. Tawny has experience in transportation analysis, traffic impact assessments, master planning, signal system assessments, project estimates, project management, and construction inspection.

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Jon Williams


Jon joined CJW in 2014 as a Water Resources Engineer and has over 40 years of work experience in the Civil Engineering field.  He has both private and public sector experience, serving as the Assistant Stormwater Engineer with Greene County, Missouri for nearly 10 years.  Jon has 30+ years of design experience in land development including site layout & grading, design of public and private infrastructure (streets, water & sanitary sewer systems) with an emphasis on stormwater conveyance, retention/detention, & water quality and other related aspects of land development industry.  Specific to stormwater management, Jon has performed watershed analyses for bridges and culverts, conducted channel studies for stream stabilization projects, FEMA regulated floodplain studies, Corps of Engineers site reviews for Section 404 impacts, as well as regional stormwater collection and conveyance.  He has worked on projects in numerous states including Rhode Island, Massachusetts, New Hampshire, Connecticut, California, Missouri, Arkansas, Kansas, Oklahoma, Kentucky, Mississippi, and overseas in South Korea.  In 2016, he was the recipient of an Environmental Excellence award for his design, construction coordination and supplemental field work associated with the Watershed Committee of the Ozarks Campus at Valley Water Mill in Springfield.

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