LEXINGTON, Mass. & SYDNEY--(BUSINESS WIRE)--GI Dynamics, Inc. (ASX: GID), a company pioneering the development of effective non-surgical approaches for treating type 2 diabetes and obesity, today announced that it has added additional depth to its executive team with the appointment of Mark Twyman to the newly created role of chief commercial officer. Mr. Twyman will report to Stuart A. Randle, president and chief executive officer of GI Dynamics.