John PowellDr John Powell is a physicist and a classically trained musician, with naturally curly hair. He has given lectures at international laser conferences and played guitar in pubs in return for free beer. He prefers the latter activity. He holds a masters degree in music composition and a PhD in physics, and has taught physics at the universities of Nottingham and Lulea (Sweden) and musical acoustics at Sheffield University. He lives in Nottingham. Read More Read Less