Wisconsin ERCP expert witnesses are gastroenterologists and advanced endoscopists who assess ERCP technique, peri-procedural decision-making, and complication management. Many practice in tertiary referral settings tied to UW Health or Froedtert, where complex biliary and pancreatic disease is common. They evaluate indications, cannulation and stenting, sedation coordination, and outcomes involving pancreatitis, perforation, or infection.