Dr. Wolf is awesome, he specializes in complicated Crohn's cases. Atlanta Gastroenterology Associates is a very large practice, largest in the SE. Dr. Wolf is at the St. Joseph's office. Saint Joseph's Hospital. http://www.stjosephsatlanta.org/
Dr. Robin Rutherford at the Emory Clinic is also fabulous. I've been seeing her for years. She takes a lot of time with her patients and is very thorough! Emory University Hospital. http://www.emoryhealthcare.org/
Dr. Michael Galambos is also wonderful, his office is at Piedmont Hospital. http://www.piedmonthospital.org/
These are three very good docs that see a lot of Crohn's patients in three different areas of town. Hope this helps!