Henry Irrgang is a Reservoir Management Consultant working for a number of Australian and international companies. He has 27 years of Petroleum Engineering experience, primarily in Reservoir Engineering, and has worked in technical, supervisory and management roles. Prior to consulting, Henry worked with Esso from 1973 to 1990, and participated in most of their simulation studies, field developments and exploration well evaluations in the period 1980 – 1990 as Reservoir Developments/Studies Supervisor. Henry worked with Bridge Oil from 1990 - 1994 and Command Petroleum (Cairn Energy) 1994 – 1998 where he was Reservoir Engineering Manager for the Ravva field development in India. He has a broad knowledge and experience in related disciplines such as drilling, facilities design, economic analysis, and commercial areas. Henry has a M.Eng.Sc degree from the University of New South Wales.