Workers’ compensation defense firm Gilson Daub opened new offices in Oklahoma City and Ventura, California. The firm said the new Oklahoma City office is part of its expansion efforts in the Midwest. The office will be managed by workers’ comp attorney Steven Hanna. Hanna joins Gilson Daub from Testan Law, where he has served clients in the Oklahoma City area since 2021. Before Testan, he was an attorney with Bonham & Howard for nearly 12 years, where his practice focused on workers’ compensation defense and select district court defense work….