Group Structural Engineers, Inc. (GSEI) is a Texas structural engineering firm with a wide array of project sector experience ranging from very large complicated building projects to small specialty “jewel box” projects. GSEI was founded in 2003 with the goal of mastering the art of engineering and providing premier structural consulting services to our clients.

We pride ourselves as collaborators, thinking outside the box, utilizing all our structural engineering skills and years of experience to achieve the design vision within budget. GSEI provides partner level attention on all projects from conceptual design throughout the completion of construction. We provide structural engineering services exclusively with a keen focus on structural creativity, teamwork, efficiency and attention to details. GSEI has established a strong reputation of design excellence and technical detailing for each of our projects and clients. GSEI utilizes the latest design and production technology, including use of BIM (Revit) to maximize project design and coordination capabilities. Our diverse structural design experience includes cast-in-place concrete, structural steel, masonry, wood framing and cold-formed steel framing. We are well versed in design of various building foundation systems, including foundations for expansive clay soils.

With a LEED Accredited Professional on staff, GSEI also provides the best use of sustainability for structural components in their building designs.


Structural Engineering

GSEI’s structural engineers collaborate with architects, contractors and owners to design solutions for projects of all types, sizes and levels of complexity. Our experienced engineers and their staff combines experience with engineering technological tools to enhance the creative process, promote effective collaboration and improve coordination, using latest versions of Auto-Cad and Revit for drawing documentation. CA Services are critical to the success of a project and good team relations. We provide periodic site observations documented with a written report and complimented with photos and action items.


  • Structural Engineering for Architects and Owners
  • 3rd Party Structural Peer Reviews
  • Design Build Engineering for Contractors
  • MBE/HUB Minority Teaming with other Engineering Firms


  • Structural Steel
  • Cast-in-Place and Precast Concrete
  • Tilt-wall Concrete
  • Post-Tension Concrete
  • Wood Framing
  • Structural Masonry
  • Drilled Piers and Concrete Footings
  • Elevated Structural Foundations


Gaylord O’Con

Gaylord O’Con  has 50 years’ experience in the structural engineering business. He experience includes  marketing, business operations and creative conceptual input.

More about Gaylord

His career includes 30 years with Datum Engineering and 20 years with Group Structural Engineers. In 30 years with Datum Gaylord grew from draftsman to production manager to principal partner and executive vice president and Board Member.  Gaylord oversees the day to day business operations of GSEI, principal level project management responsibilities and creative conceptual input. Gaylord has been involved with many projects with construction budgets ranging from less than $1M to well over $100M as principal in charge project and production manager.

Gaylord’s marketing relationships include major high profile design and construction firms and developers, architects, other engineers and contractors from around the USA, Canada and Mexico.

Gaylord is a national signature watercolor artist holding SWS, TWS and TXN signatures. (www.gaylordocon.com) He served 2 terms as the President of the Southwestern Watercolor Society in 2013-2014 and 2017-2018. His watercolor art is hanging throughout the USA as commissions.

He also serves as a president on a major board of directors in the metroplex.

Herman Gunawan, P.E.


Herman Gunawan, P.E., is a Principal with GSEI and a licensed structural engineer since 1994. Herman has over 34 years of experience and oversees all structural engineering as well as all engineering design standards.

More about Herman

His project experience includes principal-in-charge, structural engineer of record and project manager. Prior to GSEI, he was with Datum engineering for and prior to Datum he was with HKS Structures. Herman’s relationships with the design architects and his vast knowledge and experience with designing large complicated projects has made him a leader in the structural engineering field. He is sensitive to the architect’s design and collaborates on all aspects of detailing to assist the architect with achieving his design. Herman has excelled in the design of both concrete and steel structures demonstrating accuracy and hands on skills and responsiveness

Herman graduated from the University of Texas at El Paso with a Masters in Civil Engineering a B.S. in Civil Engineering from the University of Trisakti – Jakarta, Indonesia.

Registrations: Texas, Arizona

Marcus O’Con


Marcus is a Principal and Director of CAD / REVIT. Marcus has 23 years of experience and is involved in all aspects of project drawing production both with ACAD and with Revit.

More about Marcus

Marcus concentrates on collaborative coordination with architects, with a focus on accurate construction documents, detailing, coordination and meeting budgets. His project experience includes new buildings as well as the renovation and modification of existing buildings. Marcus’s responsibilities included the conceptual design of projects, project quality control, production and CAD and Revit (BIM) operations and procedures, as well as project management and the development of the typical details. Marcus is involved with projects from the beginning of drawings to the end of the CA phase.

Marcus graduated from Texas Tech with a Bachelor of Science.



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GSEI Provided Structural Engineering for the Centrum Tower $25M Redo, now complete.

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St. Michaels Columbarium Award

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IFRAA International Award for Religious Art & Architecture, Group Structural Engineers provided unique and creative structural engineering for Architect Max Levy's "Faith & Form" award winning design of St Michael &…

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Group Structural Engineers, Inc.

3626 North Hall St.
Dallas, TX 75219

(214) 397-0455

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