Mark Harris graduated from Kingston Polytechnic with a BSc in Geology in 1985. After working in an oil and gas data storage company in SE London, he joined EXLOG in 1988, based in UK and working on and offshore in UK, Denmark, Netherlands, Italy, Gabon, Pakistan and Tunisia. Mark then pursued a MSc in Petroleum Geology at RSM, London and graduated in 1992. In 1994, Mark joined IEDS to work on Indonesian non-exclusive reports. After 18 months in Tetbury he was transferred to Singapore. Specialising in SE Asia, particularlty Indonesia, and having survived the IEDS/Petroconsultants merger under IHS, he eventually left to form his own company, Geosolutions Asia, in May 2006. In September 2009, this was absorbed into the fledgling DI International under the DrillingInfo umbrella.