As one of the Northeast’s largest, most diversified construction firms, O&G serves both the public and private sectors, completing contracts ranging from multi-phase, multi-year programs to one-day emergency repairs. Our services include Building Construction (CM, D/B, GC, PM, Industrial, Special Projects); Heavy Civil (roads, bridges, water and waste treatment facilities and power plants); and Construction Materials. O&G’s experience and performance in the construction industry is unparalleled.