Alessandro's research lies at the intersection of human-computer interaction, human computation, user modelling, and machine learning. He is interested in developing methods and tools that support the design, development, control, and operation of AI-enabled systems that are well-situated around actual human characteristics, values, intentions, and behaviours. By investigating the relationship between the science and practice of design, and the digital technology that fuels intelligent products, services, and systems, Alessandro and his team study and build novel Human-Centred Artificial Intelligence methods and tools that combine the cognitive and reasoning abilities of (groups of) individuals, with the computational powers of machines, and insights from large amount of heterogeneous data. His scientific work, which consistently resulted in high-quality publications, has always been supported by substantial implementation and demonstration efforts, with emphasis on impact and continuous interaction with stakeholders from both industry and the wider society.