As one of Australia’s top antitrust lawyers, Gina Cass-Gottlieb had a reputation for being calm, measured and in control — honing a consensus-based leadership style that appears to have served her well. Now, as the head of the Australian Competition & Consumer Commission, Cass-Gottlieb’s sang froid will be put to the test, as the competition enforcer grapples with its criminal-cartel enforcement agenda, while taking on well-resourced tech companies and holding payment companies up to scrutiny. In an extended interview with MLex’s Sydney-based correspondent Laurel Henning, Cass-Gottlieb discusses both how she got to where she is and the way forward for her agency.