Ambulance Victoria CEO Tony Walker has informed staff of his early departure. Ambulance Victoria has now revelaed who will replace CEO Tony Walker in the wake of his shock departure. Peter MacCallum Cancer Centre chief executive, Professor Shelley Dolan, will lead Ambulance Victoria from November 9 after Mr Walker made the call to finish up as chief executive two months earlier than planned. Prior to joining Peter Mac, Prof. Dolan was acting chief executive and chief nurse at one of the largest hospitals in Europe and has more than 25 years of leadership experience in large-scale hospital management.