Peter retired from full time employment in 1990 and subsequently worked as a consultant for Shell UK Exploration and Production advising on compressors for the Nelson and Brent Oilfield refurbishments. He also worked on developing and updating the company's manuals for compressor systems and dry gas seal systems as well as lecturing on rotating machines at the company's training courses. He is retained as a consultant to EEMUA (The Engineering Equipment & Materials Users Association) and the Institute of Petroleum, representing these bodies on BSI committees associated with mechanical equipment for the petroleum and natural gas industries and to represent the United Kingdom on various ISO committees and working groups concerned with international standardisation for pumps, compressors and gears etcetera. Peter was convenor of ISO TC67/SC6/WG9, concerned with the development of international standards for couplings for rotating machines. He was also a member of the API Task Force revising the API Standard Paragraphs for standards relating to rotating machines. Previously Head of Mechanical Equipment, at Shell Exploration and Production, Peter was responsible for advising management, project teams and operations and for establishing company standards and policy on all matters relating to the specification, design, installation and operation of all mechanical equipment for Shell's North Sea oil and gas installations and the associated onshore terminals. Earlier experience was gained at ICI Petrochemical Division and the United Kingdom Atomic Energy Authority, Reactor Division. Over the years Peter has published a number technical papers in industry journals and at IMechE conferences and seminars. Brian Nesbitt is a highly respected consultant specialising in pump, compressor and valve technologies. He is no stranger to the European Series of books for mechanical and electrical engineers; having previously edited two editions of European Pumps & Pumping and European Valves for Control, Isolation & Safety. Brian's working career began with turbo generators up to 500MW at shop floor level. It continued with periods in drawing and design offices involving work on rotodynamic and reciprocating compressors and gas turbines. He was involved with large rotodynamic compressors, both centrifugal and axial-flow; including gas circulators for nuclear reactors and work covered in particular the special design of ancillary systems. Machine installation and interconnection was also an important feature of this work. A period in industrial refrigeration working with reciprocating and screw compressors and system design and installation was followed by engineering and applications support for reciprocating pumps. Brian is the current chairman of the BSI MCE/6/6 and European CEN/TC 197/SC5 subcommittees and is the UK Principal Technical Expert to ISO/TC 67/SC6 Joint Working Group 2 for "Oil & Gas" reciprocating pumps. David Searle is no stranger to the European Series either; having written two editions of European Electric Motors, another of the titles in this series of books for electrical and mechanical engineers. David graduated in electrical engineering, specialising in electrical machines. He was awarded a Doctorate from the University of Bristol for the study of speed changing as applied to 3-phase a.c. motors. David was also involved in the development of new motors and the introduction of computer aided design techniques, culminating in the design and development of specialised motors at GEC Machines. Although he was in charge of electrical engineering for the period involved with special motors, some work involved mechanical engineering and, in particular, noise and thermal aspects of motor performance. In 1988 he became Chief Electrical Engineer at the former Mather & Platt company. In 1995 he took early retirement coincident with writing the first edition of European Electric Motors. The second edition of this was published in 2002.