There's a group out of Alexian Brothers who do bariatric surgery, they used to only do RNY but now I believe they do bands as well. James Kane, Peter Rantis and Paul something or other...they may have a website under suburban surgical associates. This is all I remember from when I was doing my research.
Vafa Shayani did my band, he's out of Loyola in Maywood-it's a haul but maybe a bit closer than going into the city.