Dr. Teddy Altman is the Head of Cardiothoracic Surgery at Seattle Grace.
She previously served in Iraq with Owen Hunt. Although a skilled surgeon, her teaching methods can appear somewhat unorthodox.
Her arrival at Seattle Grace, followed by her profession of love to Owen has caused some friction between Owen and his girlfriend, Cristina Yang.
In Season Seven, she is branching out with a new story line all her own, involving terminally ill patient Henry (Scott Foley)