In 1987 Simon joined and eventually became CEO of Healthy Buildings specializing in indoor air quality. The firm grew to be a leader in the field. Simon earned LEED and WELL APs in 2009/2016 and honored as BOMA Life Member in 2020. He serves on the Advisory Board of BOMA Orange County.
After selling his firm he helps CEOs and CRE find ways to make their buildings more productive.