Lilker Associates, a New York City-based MEP and technology engineering firm, announced the promotion of four senior-level staff professionals to new positions. Martin Bowen, P.E., has been promoted to principal of the firm and associate department head of the Electrical Department. Steven Hammer, P.E., now a Lilker principal, was formerly project manager and senior HVAC engineer. Promoted from director to principal of Lilker's Technology Solutions Group (TSG), Morais Miranda, RCDD, has presided over the group's successful expansion, nationwide, since it debuted in 2001. David Tanenbaum, a senior member of the Lilker staff with over 16 years of experience in mechanical building system design and construction, has been promoted to senior associate and associate department head of the Mechanical Department.