Senior Electronics Engineer Sperry Sun 1990 - 1995 specialising in all aspects of MWD electronic instrumentation including, gamma scintillators, accelerometers, magnetometers and turbines. RSS 1995 - 1996. Principal Electronics Engineer developing a rotary drilling project for D&S, later acquired by Schlumberger. 1996 - 1999 transferred to D&S and Schlumberger to continue development of rotary system and a short hop communication tool. Spring Electronics 1999 to present day, development and manufacture of MWD switch mode power supplies and high voltage Wireline power supplies. PolyComm 2007 - present. Development and manufacture of the World's first closed loop MWD turbine and EM Telemetry system. Company name change from PolyComm to Turbine Dynamics, January 2012.Specialties: All aspects of harsh environment analogue design. Control system analysis for closed loop stability and dynamics. High temperature electronic design. Turbine generators/alternators. High voltage, high power, high temperature switch mode power supplies. Most forms of mathematical analysis.