Koster and Russo welcomed their second daughter, Chloe Marie, in February 2011, in addition to proud big sister, Mia Bella, 4. Koster is a senior partner at Athletico Physical Therapy in Glenview, IL, and was recently elected to the Heartland Region Board of Directors for the not-for-profit Arthritis Foundation. He has been part of the Chicago board of the Arthritis Foundation since 2008. Russo, an obstetrician/gynecologist at Advocate Lutheran General Hospital in Park Ridge, IL, specializes in general OB/GYN and robotic surgery.