[Cornerstone OB-GYN | Round Rock, TX | Michelle A. Irvin, MD | Jo Choudhry, MD | Ann Baylor, MD Cornerstone Obstetrics and Gynecology in Round Rock, TX is building a strong community of healthy women in Central Texas. As a full service practice, Cornerstone cares for the whole woman - from annual visits to pregnancy, youth to seniors. Our board certified doctors are all women, all mothers and all committed to the health of women in greater Austin. Located across the street from St. David's Round Rock Hospital, your access to the latest and greatest medical care is right at our fingertips. Visit us.]