stoic, but cares deeply about her patients. Like her successor Andy Campbell, she was good friends with Jackson. She had a short-lived relationship with resident doctor Nick Biancavilla, which she broke up when he wasn't willing to have children. Her character left the show near the start of the third season after adopting two challenged children (an HIV-positive infant and her older sister), choosing to put her medical ambitions aside to pursue a successful motherhood. Patricia Richardson as Dr. Andy Campbell (seasons 3–5), a former military doctor with the rank of Colonel, came on the staff during the third season to replace the much more ambitious and strict Dr. Dana Stowe. She is a general surgeon, and a West Point graduate, with a 27 year career. Before moving to Philadelphia, she was the Chief Medical Officer of the Army in Afghanistan. She is fluent in French, Dutch, German, Italian, and Tagalog (regional language of the Philippines). She also knows some Russian, and Japanese. Because of her father's military career (he retired as a General in the army), she moved frequently throughout her childhood. She lived in Germany as a child, and went to 9 different schools in 12 years. Andy signed up for the Army Reserves after resigning her commission, helping bring in new ROTC recruits at a local college. Her patients tend to be upper-middle-class, and often include minor local celebrities and professionals. Her character ostensibly lives the almost typical suburban nuclear family lifestyle, aside from her status as breadwinner. She has two teenage daughters, Jesse and Lizzy. Campbell kicked out her husband, Leslie, after he hit her during a domestic dispute, forcing her to examine domestic abuse issues as well as single motherhood. Campbell and Leslie had been married for thirty years without any violence in the home, and Leslie is presented as changing from a loving husband to a violent maniac over the course of a single episode. She later becomes involved with another doctor, cardiac surgeon Dr. Milo Morton but he dies in a car accident (a development forced by the death of actor Richard Biggs due to an undiagnosed heart condition). Campbell was named United States Surgeon General (which was also a stated ambition of her predecessor) at the end of the fifth season and left the show. Chris Marquette as Marco Antonio "Marc" Delgado (seasons 1–5; guest season 6), Lu's teenage son, whom she