SANTEE, Calif. — Countywide Mechanical Systems has announced the addition of three new members to its leadership team. Tom O’Sullivan and Josh Silverstein have been promoted to operations managers, and Henry Codiamat has been brought on board as estimating manager.

O'Sullivan relocated to San Diego after working all over the country for MW Builders, a general construction company owned by Countywide’s parent company MMC Corp. He specializes in working with the military on projects such as barracks, training facilities, and office buildings. In addition, he has helped deliver Leadership in Energy and Environmental Design (LEED)-certified projects that meet the military’s sustainability goals. In his new role, he will oversee project managers, superintendents, and foremen, helping them to build better relationships with Countywide’s clients as well as create more streamlined operating procedures.

Having worked in the mechanical construction industry for 16 years and holding a bachelor’s degree in HVACR Engineering Technology, Silverstein’s experience includes serving as senior project manager for a plumbing contractor as well as HVAC department manager for a mechanical contractor. He has worked with health care and private-side clients throughout his career, and he brings expertise to Countywide regarding organizational and operational processes.

As estimating manager, Codiamat will serve as Countywide’s chief estimator and will be responsible for the development, estimating, and proposing on all projects for the company. For the past nine years, he has worked in a senior estimating capacity focused on design-build opportunities with the responsibility for conceptual piping design and budgeting, project development, scope review, and contract negotiations. With nearly 30 years of experience in the plumbing and mechanical industry, he brings familiarity with commercial codes as well as Office of Statewide Health Planning and Development (OSHPD) and military standards and specifications.

MMC Corp, based in Overland Park, Kan., serves as a holding company made up of three core construction services brands: MW Builders, MMC Contractors, and Countywide Mechanical Systems. MMC Corp is a 100 percent employee-owned organization with 1,200 employees nationwide. For more information, visit

Countywide Mechanical Systems specializes in the installation, service, and maintenance of commercial HVAC, plumbing, electrical, and solar projects. For more information, visit

Publication date: 10/21/2013

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