Allison came to the bar in 1997 prior to which she had been the associate to Sheppard J in the Federal Court of Australia (1994-1997). She has appeared in the High Court of Australia, the Federal Court, New South Wales Supreme Court, and lower courts and tribunals. She practises principally in private law, in the areas of equity and trusts, commercial and corporate law, contract, property, torts, insurance and insolvency. She specializes in advice and litigation in private law issues. She was awarded her PhD for her thesis on the scope of the doctrine of equitable contribution in 2010. She also teaches in and coordinates the subject Equity and Trusts at the University of Technology Sydney and publishes regularly in private law.