Developer of the Saxon XSLT processor. Author of XSLT 2.0 and XPath 2.0 Programmer's Reference. Editor of the XSLT 2.0 and 3.0 specifications in W3C. Founder of Saxonica. Previously: PhD at University of Cambridge in 1975, then 25 years with ICL (now part of Fujitsu) and 3 years with Software AG.

Fellow of the British Computer Society.