Mark O'Brien


Chief Mechanical Engineer


  • Joined SMMA in 1988 and is the firm’s lead mechanical and HVAC engineer
  • Provides strategic and tactical direction for mechanical systems design, energy modeling, systems analysis, equipment selection, and systems master planning
  • Sought by clients for his experience in advanced technology and mission critical facilities
  • Mentors SMMA’s young engineers on careers, technical skills, and engineering solutions

Family Business

Mark credits his practical approach and hands-on style to the experiences he gained working for his grandfather and uncle, who ran a mechanical contracting company. He worked as an apprentice plumber while attending high school and college.

Client Service

Over his 27 years at SMMA, Mark has worked with thousands of clients and witnessed the progression of mechanical engineering from the drafting table to 3D- and 4D-modelling. He sees it as a privilege to be asked by long-term clients to return and renovate facilities he worked on when they were first built. 

“One of the most satisfying things about our business is the friendships and relationships built over the years. I can’t wait to get here every day to be a part of it.”