Steve Kinnersly B.Sc. D.Phil. MRSC has spent most of his career in various aspects of safety. This has ranged from modelling accidents at nuclear power plants to independent safety assessments of complex, high hazard systems involving hardware, software, people and procedures. His work has included software development and validation, technical management and consultancy. Steve was a member of the Independent Safety Assurance Working Group from its inception and led the development of its Code of Practice for Independent Safety Assessors (ISAs). Now retired, he maintains an interest in safety and related matters