Professor Amaratunga is a Fellow of the Institute of Electrical Engineers and a Chartered Engineer. He was elected a Fellow of the Royal Academy of Engineering in 2004. Then in 2007 he was awarded the Royal Academy of Engineering Silver Medal for outstanding personal contributions to British Engineering. He is the founder and was Chief Technology Officer and Executive Director of power management integrated circuits company Cambridge Semiconductor Ltd. He has published over 500 academic papers, which have been cited more than 40,000 times, and is the inventor of 34 patents. Professor Gehan is highly regarded in the European, American, and Asian industrial sectors and has engaged in extensive technological and commercial collaborations with companies such as Philips and Ford. He is also the founder of four start-up technology companies.