Gertz and her husband are members of the investment group led by Mark Attanasio which purchased the MLB franchise Milwaukee Brewers. Gertz-Ressler High Academy, a member of The Alliance for College-Ready Public Schools, is named for Gertz and her husband. They also became owners of the NBA team Atlanta Hawks in 2015. Gertz represented the Hawks in the NBA Draft Lottery for the 2018, 2019, and 2020 NBA drafts.