In May of 2016, Matthew Clark established Green Site Services Group, Inc., a company initially focused on property maintenance and disaster restoration. Previously, he had teamed up with his brother to form TMC Environmental after graduating college. He served in the capacity of CEO at TMC for 20 years leading it from a small start-up to a formidable presence in New England. Soon, Matthew realized that TMC had reached critical mass through organic growth and began the process of seeking to expand through mergers and acquisitions, which lead to a merger of two of the largest and most well-respected environmental services firms in New England with ENPRO Services.
Within a year of integrating the companies, ENPRO was positioned firmly as an industry leader which drew sharp attention of some of the much larger national competitors in the environmental marketspace. Soon thereafter, ENPRO was acquired by National Response Corporation where he stayed with the firm for a short period to ensure an orderly transition to the new company.