Dr Ian Gray is the Managing Director of Sigra Pty Ltd a company he set up in 1994. Sigra consult, provide measurement services and manufacture for the civil, mining and petroleum industries with a focus on geomechanics applications. He has a BE (civil) degree from Auckland University (1976), a MAppSc in engineering geology – hydrogeology from UNSW and a PhD on the topic of coal mine outbursts through UNSW, (1983). The PhD was gained while working for Australian Coal Industry Research Laboratories in mines. He joined the Hong Kong Government as a geotechnical engineer in 1983. In his 6 years in HK he worked on slope stabilisation, piled foundations, tunnels and as the Colony’s hydrogeologist. In 1989 he returned to Australia to put a gas drainage operation into a mine followed by a period with Douglas and Partners, geotechnical consultants. This was followed by four years as Principal Engineer, Mine Safety Research with the Queensland Government. Ian has written some 70 papers on such diverse topics as drilling, pile behaviour and rock mechanics. He also holds several patents.