John E. Green Company is a family-owned mechanical and fire suppression contractor providing fire sprinkler and suppression systems alongside piping, plumbing, HVAC, fabrication and design-build services. It serves commercial, institutional and industrial clients across the eastern half of the United States and offers 24/7 emergency service. The company is headquartered in Highland Park, Michigan, and has been in business since around 1909. It is registered with the Texas State Fire Marshal’s Office as a fire sprinkler contractor (SCR-G-3262146).