Vincenzo Antonuccio-Delogu is a research astronomer at the Italian National Institute for Astrophysics, Osservatorio Astrofisico di Catania, Italy. His research focuses on dynamics and substructure in clusters of galaxies, parallel N-body simulation codes and galaxy formation and evolution.

Joseph Silk is Savilian Professor of Astronomy at the University of Oxford, and Director of the Beecroft Institute of Particle Astrophysics and Cosmology (BIPAC). His research interests include theoretical cosmology, dark matter, galaxy formation and the cosmic microwave background.