Mark Allen

Subsurface Director

Mark Allen is a Petroleum Engineer with 30 years’ experience in international exploration, appraisal and development operations.

Mark’s unique holistic approach to subsurface and field development continues to bring in new opportunities and prospects to the Assala business and long-term future. Successful workover and drilling programmes have delivered over 150% replacement of the company’s reserves since its inception, as well as a stoppage of the natural decline, and an increase in production levels.

Prior to joining Assala Energy in 2017, Mark managed Tullow Oil’s African Development and Operations team. Under his guidance, the Gabon portfolio achieved a seven-year production plateau through the systematic identification and execution of infill drilling and field redevelopment opportunities. Mark also oversaw Tullow’s exploration operations in over a dozen countries, delivering high-impact discoveries in Ghana and Kenya, where he specialised in field appraisal, early development planning and resource booking.

Mark began his career as a Schlumberger Wireline Field Engineer working at well sites in Europe and the Middle East, before qualifying as a Reservoir Engineer with Shell, where he developed assets in the UK North Sea and Russia.

Mark holds a BEng in Mechanical Engineering from the University of Edinburgh, an MEng in Petroleum Engineering from Heriot-Watt University, and an MSc in Management from Stanford University Graduate School of Business.