Need info about RNY to DS

My revision was open.  

Is there a surgeon in the Chicago area that does RNY to DS surgery?  My current doctor is Dr. Peter Rantis and am not sure if he does this surgery.

If you go here, you will find a list of surgeons specializing in DS. http://www.dsfacts.com/duodenal-switch-surgeons.php

I had a lap revision from Rny to DS. I traveled from Atlanta to dallas, Texas. Dr. Ayoola was my choice after doing my research. I am a year post op with no issues. I was in the hospital 3 days. I stayed in Texas about 10 days so I could do a post op visit. I flew home. I returned for my 3 month, 6 month and 1 year check up but I'm sure I could have had check ups with local physicians. I had questions about the changes in my system but no complications. 

Thank you for the information, I really appreciate it!