Thorson Baker + Associates - Consulting Engineers
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James W. Allman Associate | Director of Computer Operations & CAD | CAD

Jim has been with Thorson • Baker + Associates since its inception in 1993. With over 30 years of experience in structural design, he is responsible for the management of the structural CAD/Revit department, CAD standards and making certain project schedules are achieved. Jim also serves in the capacity of IT systems administrator overseeing the firm network infrastructure providing system support, system documentation, updates, security, back-up methodology and software management and updates.


David J. Smith Associate | Systems Specialist

Dave joined Thorson • Baker + Associates in 1994. His dedication, positive attitude and willingness to help others has earned him an associate position at TBA. Dave is responsible for implementation of network systems upgrades, applications, user interface and trouble shooting. He provides assistance in recommending new electronic equipment and equipment upgrades. Dave also maintains network equipment, servers, work stations, plotters, printers, phone system and personal electronic devices.


Richard S. Tushar Associate | Senior Project Manager | Electrical

Rich joined Thorson • Baker + Associates in 1997 as one of the first members of the Electrical Department. He serves as an Electrical Team Leader. Rich's primary responsibilities include managing national retail programs for the firm, developing and maintaining client relations, as well as, working closely with staff overseeing production of electrical construction documents, energy code documentation and construction administration.


Nathaniel D. Roop Associate | Senior Project Manager | Structural

Nate joined Thorson • Baker + Associates, Inc. (TBA), in October 2005 as Structural Design Engineer and quickly advanced to the level of Senior Project Manager. His experience includes project schedules, structural design, preparation of construction drawings and specifications, construction administration, and computer applications. Nate’s project experience includes corporate, medical, commercial, educational, and public projects with a concentration on large retail projects. In March of 2018, Nate was promoted to Associate.


Patricia Fellenstein, PE Associate | Senior Project Manager | Structural

Patty joined Thorson • Baker + Associates (TBA), in April 2001. Responsible for structural design, detailing, material procurement, and production management, her structural designs include a variety of steel, concrete, and masonry structures and reinforced concrete foundations.
Patty’s project involvement includes project schedules, structural design, preparation of construction drawings and specifications, construction administration, and computer applications.


Richard C. Proppe, PE, LEED AP, CxA Associate | Commissioning Manager | Mechanical, Commissioning

Richard (Rick) joined Thorson • Baker + Associates (TBA) in 2011 as a Senior Project Manager in the Mechanical Engineering Department. His 35 years of mechanical engineering and commissioning experience includes the design and Commissioning of HVAC and plumbing systems, electrical and sprinkler system condition surveys, system and facilities evaluation and planning, design and specification writing and information technology support. 

His experience with a former firm included seven years as manager or director of engineering with responsibilities of staff training for REVIT Parametric Modeling and Trace Building Energy and cost-op analysis. Rick was promoted to Associate in March 2020.


Eric Fritz Associate | Senior Project Manager | Mechanical

Since joining Thorson • Baker + Associates (TBA) in 2019, Eric serves as Associate and Senior Project Manager in the Mechanical department. He is responsible for the production of mechanical construction documents from project inception through and including construction administration. Eric’s experience in mechanical design of commercial, residential and assisted living buildings includes conceptual design, preparation of construction documents and energy code compliance documentation, and assistance in project closeout. He also provides mechanical design support for mechanical project engineers and designers.


Jason Bornstine, PE Associate | Senior Project Manager | Structural

Jason joined TBA in 2012, bringing with him a solid foundation in commercial construction management. After earning his master’s degree, he advanced through various roles, beginning as a Design Engineer and ultimately progressing to his current position as Senior Project Manager. In 2025, Jason’s contributions and leadership were recognized with a promotion to Associate. His unique experience has allowed him to excel in both new construction and renovation projects. Jason has managed projects across the United States, and his hands-on experience on job sites has consistently proven invaluable. By leveraging his practical knowledge, he has been able to save clients both time and money, ensuring successful outcomes for every project he oversees


Kyle Richards, PE Associate | Project Manager | Structural

Kyle became a part of TBA in 2012 as a Design Engineer and has since progressed to the position of Associate. During his time with the company, Kyle has served in roles as both Project Engineer and Project Manager, engaging in a wide variety of engineering projects. His duties have encompassed structural design, the creation of construction drawings and specifications, and managing construction administration. Kyle’s expertise covers multiple sectors, including manufacturing, retail, high-rise residential, medical, and educational facilities. He has demonstrated a remarkable talent for designing intricate structures and continues to thrive in project coordination and administration.