The principal of Leach Bros., Inc., Joseph J Leach P.E. has both professional licenses and construction licenses. During his career, he has been retained as a consultant and expert witness on cases for both plaintiffs and defendants. These clients have included the following, corporations, insurance companies, attorneys’ offices, and private citizens.
These assignments have included heating and air-conditioning concerns, domestic water, and sanitary plumbing maters, and piping system failures. Joseph Leach is a both a licensed Master Plumber, and HVACR contractor in New Jersey, which requires both installation experience, and knowledge of the plumbing and building codes. His background in both field construction work and the management of a construction/ service firm gives him a unique perspective that few engineers have.


Professional Organizations/Memberships
ASME American Society of Mechanical Engineers
ASHRAE American Society of Heating, Refrigeration and Air Conditioning Engineers
NJBIA Energy Council for New Jersey Business and Industry
NJBIA Economic Development for New Jersey Business and Industry
Internal Code Council (formerly BOCA): Professional member


40 years of experience in plumbing, HVAC and engineering.