The GT Environmental Board of Directors (BOD) has decided to promote Ronald C. Hansen to President and Robert. C. Cromwell, III to Vice President.

Ron Hansen joined GT back in 1996 and became a partner in 2007. Ron is manager of GT’s Permitting & Compliance (P&C) Business Unit. Ron began his environmental career as a Co-op for PEI Associates in Cincinnati providing air measurement services. Ron graduated as Civil and Environmental Engineer from the University of Cincinnati in 1991. Following graduation, Ron worked for TRC in Denver, Colorado providing air measurement services. Ron transferred to Columbus, OH where he assisted Chuck Taylor with establishing TRC’s Columbus, Ohio office. GT’s Permitting & Compliance Business Unit provides industrial and public sector clients with air permitting, stormwater permitting, wastewater permitting, SPCC Plan development, SWPPP development, hazardous waste management, and environmental auditing services.


Rob Cromwell joined GT in August 2021 as a Principal Consultant to help bolster GT’s already strong Materials Management and Sustainability (MM&S) Business Unit. Rob, Jim Skora (Principal Consultant and MM&S Business Unit Manager) and Dan Graeter (Senior Manager) each have over 30 years of experience in the solid waste planning and environmental consulting sector. Rob earned his Civil and Environmental Engineering Degree from the University of Cincinnati in 1991. His consulting experience includes waste management, recycling, sustainability planning, remediation, landfill gas management, groundwater monitoring, air permitting, SWP3 and SPCC planning preparation, industrial hygiene, safety, indoor air quality, facility decontamination, industrial cleaning, emergency response services and more. Through the years, Rob has helped both public and private organizations address environmental and sustainability needs. His background includes supporting government organizations, terminal and pipelines, manufacturing, industry, waste management facilities, universities, hospitals, construction, commercial businesses, transportation facilities, hospitality, gas stations, and casinos.

Please join us in congratulating Ron and Rob on their most deserving promotions.