Brendon Mattis

Brendon Mattis is a Principal at EEI and the branch manager of the company's Seattle, Spokane, Portland, and Washington DC offices. His passion for sustainability began at an early age and grew into a career focused on improving building systems and reducing the environmental impact of the built environment. With over 25 years of experience in commissioning, Brendon is a respected local industry leader known for his innovative solutions, attention to detail, and collaborative approach. His commitment to excellence has made him a trusted authority in driving sustainable change through engineering and building performance. Brendon has extensive experience in a variety of projects including commercial buildings and convention centers. Notable projects include Seattle Convention Center, Spokane Convention Center, Amazon HQ, HQ2.