Gravitek Engineering Services, PLLC.

About Us

Structural Engineer and Design
serving Houston, TX
(and the Surrounding Areas)

GRAVITEK specializes in structural engineering design and evaluations of buildings, foundations, and other structures as well as engineering project management.
Our capabilities include calculations and design of new construction, design retrofit, solution implementation, detailed structural analysis, technical reporting and inspections.
Expertise in structural steel, cold-steel, timber and concrete structures


Professionally registered firm with the Texas Board of Professional Engineers, TBPE Firm Registration No. F – 17873
Windstorm Certified by the Texas Department of Insurance
Professional Liability, General Liability, and Workers Compensation
‘A+’ Better Business Bureau rating

Safety is Our Priority

GRAVITEK is committed to maintaining a safety-minded culture beginning with our individuals, while at work or at home. We strive only to provide the safest and soundest solutions to our clients without shortcuts and demonstrate safe behavior on-site. Through continual education and experience, our team stays abreast of safety concerns and practices.

Company Values

GRAVITEK Engineering Services, PLLC is fully committed to exceeding our clients’ expectations. We take pride in our engineering and conform to the highest ethical standards in accordance with the National Society of Professional Engineers and the Texas Engineering Practice Act.
  • Quality: We maintain a paramount awareness for technical and safety requirements and perform all design assessments in accordance with contract requirements, applicable specifications, codes and standards pertaining to structural engineering.
  • Loyalty: We strive to maintain strong client relationships and work with our clients to fully understand the concerns and challenges of any project or task. Our customers are at the center of everything we do and the success of their project and our business counts on that. Seeing satisfied clients makes us proud and keeps us motivated to provide exemplary service.
  • Adaptability: We maintain focus during the midst of change and work to provide alternate and technically innovative solutions to clients. Our company maintains its commitment to continual education in the practice of engineering and construction to stay at the forefront.
  • Community: We have a small business mentality with a primary intention to support local businesses and aid in building infrastructure within our community by supporting local job markets. In addition, we desire to help local contracting businesses grow by providing superb engineering work and giving our clients the edge to succeed

Core Team

Nathaniel E. Contreras, PE, PMP
Kameron A. Stroup, PE
Jimmy Zheng
Robert McCathren P.E.
General Manager 
  • Bachelor of Science in Civil Engineering from Texas A&M University – 2002  
  • Master of Engineering in Structural Engineering from University of Houston – 2006 
  • Texas Registered Professional Engineer: #104590
  • Texas Windstorm Certification: #104590
  • Project Management Professional: #1879109
Technical expertise in engineering and design of residential and commercial building constructions in expansive soils, hurricane wind and flood zones.  Robust background in engineering design and analysis of timber, steel, and concrete foundation structures, as well as engineering management.
Lead Structural Engineer 
  • Bachelor of Science in Civil Engineering from Texas A&M University – 2010
  • Master of Engineering in Structural Engineering from Texas A&M University – 2011
  • Texas Registered Professional Engineer: #120095
Active background in timber, steel and concrete structures.
Architectural Designer
  • Bachelor of Science in Chemical Engineering from Louisiana Tech University – 2008
  • Master of Architecture from University of Louisiana Lafayette – 2017

Soon after earning his degree in Chemical Engineering, Jimmy decided to pursue his passion in Architectural Design. Jimmy’s background consists of both residential and commercial design developments, utilizing such programs as Sketchup, Revit, AutoCad, and 3D Max.

Currently pursuing his AIA Licensure.

Head of Accounting

Kolin Consulting, LLC provides us with general accounting and bookkeeping services year-
With over 20 years of experience, Maureen is proficient in accounting, human recourses, and
project management. Her hands-on management style and expertise in strategic planning and
implementation work to ensure company growth and stability. Effective communication skills
commit others to action and allow her to convey complex information into language easily
understood by everyone.

Design and Construction Management
Weed Design & Construction offers full service design coordination, including residential and commercial developments.
James brings over 30 years of civil/structural design and construction experience working in municipal, commercial, and industrial applications. James has an extensive background in concrete foundations, steel structures, and residential timber structures.
Offshore and Structural Engineer
Robert is a ten year veteran of the offshore energy industry. He graduated with a degree in Maritime Systems Engineering from Texas A&M University at Galveston.
His experience spans the spectrum: from the trial-by-fire mentality of small engineering consulting firms, to the long-term focus of the largest floatover projects in the world, to the rapid-fire pace of subsea operations. View Robert’s website here.
Nathaniel E. Contreras, PE, PMP
Kameron A. Stroup, PE
Robert McCathern P.E.
Jimmy Zheng

Professional Affiliations