7703 Crain Highway
Upper Marlboro, MD 20772
Co-Founder & Owner
Sean founded Duffy Mechanical Corporation in 1994. He hired a team of goal-oriented managers and staff with in-depth knowledge of the industry. Duffy Mechanical grew into a multi-million dollar company and tackled complex projects at a variety of installations including Prince William Hospital, Dulles and Baltimore Washington International Airports, and the Ronald Reagan Office Building. As CEO, Sean strove to foster an environment committed to innovation and team-work; encouraging managers and staff to continue developing their expertise through additional training and mentorship programs. He believes this philosophy benefits individuals as much as the company as a whole.
In 2009, Sean and Erik founded H&D Mechanical, accomplishing superior work in a variety of settings, including medical, scientific and commercial projects. Sean’s vision for strategic growth and expansion has helped H&D become a dominant player in the market.