For over thirty years Dr. Bob Walker has been a leader in defence science and technology in Canada and internationally. In his early career, his highly innovative approaches to acoustic signal processing kept the Canadian Navy and Air Force at the forefront of submarine detection. As a senior manager and now CEO of Defence Research and Development Canada, he has led the development and implementation of new scientific programs, nationally and internationally, that have advanced knowledge and stimulated engineering and technology development in the areas of defence and public security in this post 9/11 era.