Professor Greg Parker was Head of the Nanoscale Systems Integration Group at Southampton University in southern England until his recent retirement. His deep-sky astronomical images have been published in Astronomy Now and Sky at Night magazines. He is the author of Introductory Semiconductor Device Physics (IOP, ISBN 0750310219), and has written many scientific papers and articles, mostly in the area of photonics and optoelectronics, as well as a chapter (Guided-wave Optical Communications: Materials) in Elsevier’s Encyclopaedia of Materials: Science & Technology.