Dr Malcolm Walter is Professor of Astrobiology at the University of New South Wales, Australia. He is Director of the Australian Centre for Astrobiology. He has worked for 45 years on the geological evidence of early life on Earth, including the earliest convincing evidence of life. During 1999 his book "The Search for Life on Mars" was published by Allen & Unwin. He has published more than 130 articles and several other books. In 2004 he was elected a Fellow of the Australian Academy of Science, and in 2005 he was made a Fellow on the Geological Society of Australia.