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Transportation engineering firm DMJM Harris recently appointed Diana Mendes, Gary Morris and Michael Marchelletta senior vice presidents.

Specializing in transit system land use and environmental management, Mendes also was named DMJM Harris’s transit-rail West manager.

Most recently geographic business unit manager for the firm’s New York, New Jersey and Connecticut metropolitan offices, Morris now will be responsible for overall project performance in the New England region.

Responsible for leading the company’s efforts on strategic projects across all of the firm’s business practices, Marchelletta will seek to form strategic alliances for a variety of transportation initiatives.