Hard to answer, it is best to have surgery close to home. Your chin that you say needs reduced maybe actually be your entire jaw or just the chin. Lots of variables. Many types of docs do chin surgery. Oral and Max Surgeons, ENT, Facial Plastics and Plastic surgeons frequently do this. Find someone that can show you many cases of different options, i.e. mandibular reduction, reduction genioplasty, etc.
Joe Niamtu, III DMD
Cosmetic Facial Surgery