Three field surgical associates have joined the medical staff at Methodist Hospitals, offering a full range of surgical care in their Gary practice. Dr. Timothy Field is a board certified general surgeon specializing in general, vascular and thoracic surgery. Dr. Carl Johnson is a board certified general surgeon who specializes in breast, colon, gallbladder, hernia and vascular access procedures. Dr. Michael Romberg is a board certified general surgeon who specializes in a full range of cancer surgeries. Dr. Romberg's oncology expertise includes lumpectomy, mastectomy, thoracoscopy, mediastinoscopy, sentinel node biopsy and more.