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Core Values



We represent our clients’ best interest with regulatory agencies, local government, and the public.


We bring passion to each assignment. Passion for the environment and passion to achieve our clients’ needs to meet your goals and objectives.

Problem Solver

Sometimes we are an extra set of hands, but most often we are problem solvers for complex technical and regulatory requirements.

Pride of Ownership

Every member in the organization takes pride of ownership in our work, delivering quality products that deliver solutions that make Happy Clients!

Team Player

We are an extension of our clients’ environmental team. Many of our projects require a team concept to complete the assignment. Everyone on the team has an important role in the project’s success.

Take Initiative

We expect our professionals to be self-starters. That means anticipating project needs and actions necessary to complete a project on-time and under budget.


Our Mission

To attain “Happy Clients” by solving complex environmental regulatory requirements on-time cost-effectively.



About Us

GT Environmental, Inc. (GT) is an environmental consulting company headquartered in Columbus, Ohio. GT provides environmental consulting throughout the Midwest and beyond.

GT was established by Michael Greenberg and Chuck Taylor in November 1995 as an environmental consulting company providing industrial clients with environmental permitting and compliance consulting and municipal clients with solid waste management and planning services. Michael Greenberg and Chuck Taylor both started their environmental careers with Ohio EPA. Ron Hansen joined GT in September 1996 and became an owner in 2007. Ron Hansen started his environmental career as a Co-op for an environmental consulting firm and after graduation as a consultant providing emissions measurement services for a large national environmental consulting firm. Chuck Taylor retired in 2013 and Michael Greenberg retired in 2021. Jamie Zawila joined GT as an owner in April of 2022. Jamie has 25 years of professional experience in sustainable materials management solutions for diverse industrial and public sector clients. Ron and Jamie are the current owners of GT.

Since our inception, GT has demonstrated steady growth that can be attributed to our goal of attaining and maintaining long term “Happy Clients.” Many of our clients have been with GT since our inception. GT’s business philosophy is to: (1) have senior staff working on every project; (2) have subject matter experts working on your project; and (3) be strong advocates for our clients’ interest.

GT operates two business units that incorporate most of industries’ and governments’ environmental needs. Ron Hansen manages GT’ Permitting & Compliance (P&C) Business Unit and Jamie Zawila manages GT’s Materials Management & Sustainability (MM&S) Business Unit.

The P&C business unit is sophisticated enough to work for Fortune 500 companies and cost-effective enough to work with small businesses. P&C prepares Prevention of Significant Deterioration (PSD), Non-Attainment New Source Review (NNSR), Title V and minor source air permits. We have expertise and experience in conducting air quality modeling using AERMOD, AERSCREEN, CALPUFF, and SCREEN3 for major and minor source air permitting projects. We assisted our clients with obtaining air permits for multi-billion-dollar projects such as a base load coal-fired power plant and a new integrated steel plant. P&C also excels in preparing NPDES permit applications and Stormwater Pollution Prevention Plans and Spill Prevention, Control, and Countermeasure Plans.

MM&S provides municipal and private sector clients with strategic materials management planning and reporting services. We offer sustainable solutions to our clients’ materials management challenges. We are experienced with developing and operating solid waste transfer stations, household hazardous waste collection centers and recycling centers. We offer full-service capabilities from planning, conceptual design, and permitting.

Corporate Office

2400 Corporate Exchange
Suite 150
Columbus, OH 43231 (map)
(614) 794-3570

GT Environmental Can Help Your Organization

Find out how our team can assist your facility by completing our contact form and our professionals
will answer your questions and put together a plan to achieve your goals.

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