About Us

We are a research group based at the Complexity Science Hub Vienna with international collaborators at the Santa Fe Institute, Bucerius Law School, Hong Kong University, amongst others.

Our Team

A team with expertise in mathematical and computational modeling working on developing conceptual and analytical tools commensurate with the complexity of social and biological dynamics.

  • Eddie Lee
  • FWF ESPRIT Postdoctoral Fellow
  • Niraj Kushwaha
  • PhD Candidate
  • Ernesto Ortega
  • Postdoc


Eddie Lee

Eddie leads the Complex Collective.

He is a postdoctoral fellow at Complexity Science Hub Vienna since 2021 and formerly at the Santa Fe Institute as a Program Postdoctoral Fellow. He is a recipient of the FWF ESPRIT postdoctoral fellowship and a former NSF Graduate Research Fellow. He holds a PhD in Theoretical Physics from Cornell University and received his AB in Physics from Princeton University. His CV is available here.

Google Scholar.

Niraj Kushwaha

Niraj joined the Complexity Science Hub Vienna as a Ph.D. candidate in August 2021. He has a masters in physics from the Indian Institute of Technology Indore. His master’s thesis was in the field of non-linear dynamics and complex networks.

For his masters’ thesis, Niraj performed network modeling using Kuramoto’s oscillators to study collective behavior found in many real-world systems and also studied critical transitions between synchronization and chimera (solitary) states found in dynamical networked systems. In order to study the phase space of such systems, he used a unique technique that used machine learning to draw boundaries between the different phases.

Niraj’s research interest lies at the intersection of statistical physics, collective behavior, network science, computational modeling, data analysis and machine learning. Through his research, he wishes to study the hidden universal laws of nature, using various tools and techniques that fall under the umbrella of complexity science.

Currently at the Hub, Niraj is building a systematic framework to study armed conflicts and also studying various emergent regularities that are found in armed conflicts.

Personal website.

Ernesto Ortega

Ernesto is currently a PhD candidate at Havana University. His current research is based on the study of epidemic processes in complex networks. In 2023 he will join the Complexity Science Hub Vienna as a postdoc researching in the field of complex systems and collective behavior with particular focus on evolutionary systems driven by innovation and obsolescence processes.