Williams is an associate director and national technical leader - Aboriginal heritage at EMM Consulting Pty Ltd,a leading Australian, employee-owned, multi-disciplinary planning and environment consultancy company. Through his current and previous roles extending over two decades, Williams has become one of the leading archaeological consultants in the Sydney basin, and has undertaken work in every Australian State and Territory. He has mentored a team of ~20 archaeologists, managed annual budgets of ~$2 million, and has produced over 200 reports on archaeological sites (and associated developments) across all parts of Australia. As part of this role, he routinely supervises large-scale archaeological excavations (5-10 annually) composed of 10+ archaeologists and Aboriginal representatives across NSW, especially in the Sydney Basin, and is well-known for his knowledge and experience in the investigation of archaeological deposits in deep sand bodies
Alan is also well established in academia, affiliated with multiple universities and an associate investigator of the ARC Centre of Excellence for Australian Biodiversity and Heritage. He is widely published, with some 35 articles on past Aboriginal demography, palaeoclimatology and other key archaeological debates in journals such as Nature Communications, Proceedings of the Royal Society Series B, Journal of Archaeological Science, and Australian Archaeology. His work significantly advances the exploitation of radiocarbon dates as a mainstream and reliable proxy for exploring hunter-gatherer behaviour in Australia; and provides a number of future directions for both time-series analysis and Australian research more generally. Globally, the analyses undertaken remain at the forefront of the technique, and are routinely used, applied and critiqued across the world.