Achilleas Psyllidis is an Assistant Professor of Location Intelligence and Spatial Analysis and Director of the Urban Analytics Lab at Delft University of Technology. He is also the Director of the Social Urban Data Lab at the Amsterdam Institute for Advanced Metropolitan Solutions. He is further affiliated with the Leiden-Delft-Erasmus Centre for BOLD Cities.

His research bridges urban planning & design, sustainable urban mobility, and spatial analytics. He explores how the design, structure, and perceived qualities of the urban environment affect the mobility and accessibility opportunities of different population groups. He focuses on active travel modes like walking and biking, as well as the role of mobility systems and land-use distribution in promoting place-based encounters and interactions among individuals and groups (co-accessibility). Additionally, his work includes critical assessments of sustainable neighborhood development models, such as the concept of the 'X-minute City'.

To realize these objectives, he develops human-centric models and measures of pedestrian accessibility to essential services and amenities. These measures are subsequently integrated into open-source software tools (e.g., CTwalk Map), facilitating the design, planning, and policy toward more livable and inclusive communities. Aligned with this goal, he participates in and leads several Dutch, European, and international research projects on cities, mobility, environmental exposures, health, and well-being. Additionally, he is a member of TU Delft’s ‘Pathways to Mobility Futures’ Vision Team.

• Accessibility
• Sustainable urban mobility
• Walkability
• Urban analytics
• Land-use & transport interaction
• Proximity planning & X-minute cities
• Healthy cities

Before joining the Department of Sustainable Design Engineering, he held a postdoctoral position in Urban Data Science within the Web Information Systems group at the Faculty of Electrical Engineering, Mathematics, and Computer Science, TU Delft.

He holds an Engineering Diploma (Summa Cum Laude) in Architectural Engineering with a focus on urban planning and a Master of Science degree (Summa Cum Laude, Highest GPA) in Spatial Planning from the National Technical University of Athens. He earned his PhD in Spatial Data Science from TU Delft, Faculty of Architecture and the Built Environment. During his doctoral studies, he was affiliated with the Joint Research Center for Spatial Information between TU Delft and Wuhan University, as well as the Joint Research Center for Urban Systems and Environment between TU Delft and South China University of Technology.

He is a scholar of the Onassis Foundation, the European Union Social Fund, the Greek State Scholarships Foundation, the Foundation for Education and European Culture, and the A.G. Leventis Foundation.