Dr. Ross Walker is a non-interventional cardiologist and owns a medical practice in Lindfield on the upper north shore of Sydney. Dr. Walker commenced stress echocardiography in 1992, and has since performed over 50,000 studies and 80,000 transthoracic echocardiograms. Dr. Walker introduced coronary calcium scoring into Australia in 1999 in conjunction with the Sydney Adventist Hospital. His other area of expertise is in the field of preventative cardiology and he has also commenced a related service in arterial screening, which is an indirect measure of endothelial function and arterial stiffness, and does not involve irradiation or injections. Dr. Walker has published 7 best-selling books on preventative cardiology, and lectures both nationally and internationally on this subject.