Mark Harman works full time at Facebook London and also holds a part-time professorship at UCL. At Facebook he works with the Sapienz team. Sapienz has been deployed to test mobile apps, leading to thousands of bugs being automatically found and in multimillion line communications and social media apps in daily use by over 1.4Bn people worldwide. He is known for his scientific work on Search Based Software Engineering (SBSE), source code analysis, software testing, app store analysis and empirical software engineering. He co-founded the field SBSE, a research area with authors spread over more than 40 countries. In addition to Facebook itself, Mark’s scientific work is also supported by an ERC advanced fellowship grant and by the UK EPSRC funding council.