As CEO of Leading Real Estate Companies of the World (LeadingRE), Boomsma controls one of the nation's most influential brokerage networks with more than 550 firms and 134,000 agents across 70 countries. The invitation-only organization counts many of the nation's largest brokerages as members. Boomsma joined LeadingRE in 2005, creating its Luxury Property International, and continued to serve in that role until becoming brokerage network CEO in 2018.