Welcome to Oral & Maxillofacial Surgery Consultants of Wisconsin, S.C. Dr. Ronald H. Nellen is an oral maxillofacial surgeon in the Greenfield, Wisconsin area. He manages a wide variety of problems relating to the mouth, teeth and facial regions. He practices a full scope of oral and maxillofacial surgery with expertise ranging from corrective jaw surgery to wisdom tooth removal. He can also diagnose and treat facial pain, facial injuries and TMJ disorders, and performs a full range of dental implant procedures. Our office is located in Greenfield, WI.