Brian's governmental work included inter-governmental agreements on social and environmental policy. He is a Fellow of the Academy of Social Sciences Australia, and vice-president of the International Association for Public Policy. His applied research interests include program evaluation, evidence-informed policymaking, managing controversial and wicked problems, improving collaboration, the future of expertise, post-truth politics, and building trust in decision-making processes. He has edited or written more than a dozen books, including Wicked Problems in Public Policy (2022) and Reconsidering Policy (2020); together with more than 100 research articles, 30 chapters and 20 research reports.