Atlanta-based King & Spalding will announce the opening of its San Francisco office today with two partners from the local office of Drinker Biddle & Reath.

Litigators Donald Zimmer and Brenda Buonaiuto will join the firm’s product liability and toxic tort practice. Zimmer was vice chairman of Drinker’s product liability and mass tort practice. Elaine Tseng, counsel with the firm’s FDA/health care group, will relocate from the firm’s D.C. office.