Brennan serves on the Board of Directors and leads Mazzetti’s global Lighting Design Studio, delivering technologically advanced, environmentally responsible lighting solutions that support human health. He has presented for the Smithsonian Institution, the U.S. Department of Energy, LightFair, IES conferences, Green Schools conferences, Sustainable Living Fairs, and multiple branches of the U.S. Green Building Council. Brennan regularly educates clients and colleagues through accredited presentations on sustainable lighting design and human health. His portfolio includes eight AIA COTE Top Ten Awards. His work also spans Living Building Challenge projects, Net Zero buildings, and LEED Platinum–certified facilities.