David Ray. PhD, is a Stratigraphy Advisor at Halliburton Landmark, responsible for advancing stratigraphy-focused innovations and applications. He was with Neftex Insights since 2008 and previously worked as an earth science tutor. He has published numerous academic papers, is an Honorary Research Fellow at the University of Birmingham, UK, and is a member of the Stratigraphy Commission and the International Subcommission on Silurian Stratigraphy. David has a degree from Imperial College, UK, and a PhD from the University of Cincinnati, USA.