Julien Tailleur, Director of Research, CNRS, University of Paris,Gerhard Gompper, Professor of Physics, University of Cologne,M. Cristina Marchetti, Professor of Physics, University of California Santa Barbara,Julia M. Yeomans, Professor of Physics, Rudolf Peierls Centre for Theoretical Physics at
the University of Oxford,Christophe Salomon, Director of Research at CNRS, Laboratoire Kastler Brossel, ENS Paris

Julien Tailleur is a statistical physicist working at CNRS and Université de Paris. He has worked on a broad range of problems in non-equilibrium statistical mechanics and its applications to biophysics and active matter.

Gerhard Gompper is Professor of Physics at University of Cologne and Institute Director at Forschungszentrum Jülich. He was educated at Ludwig-Maximilians-University in Munich, where he also earned his PhD.

Cristina Marchetti is Professor of Physics at the University of California Santa Barbara. She was educated in Italy at the University of Pavia, earned her Ph.D. in the U.S. at the University of Florida, and joined the faculty at UC Santa Barbara in 2018.

Julia Yeomans is Professor of Physics and Head of the Rudolf Peierls Centre for Theoretical Physics at the University of Oxford and Pauline Chan Fellow at St Hilda's College Oxford.

Christophe Salomon is Directeur de Recherches au CNRS, Laboratoire Kastler Brossel, ENS Paris.

Introduction
Part 1: Collective behaviours in active-matter systems
1. Dry, aligning, dilute, active matter: A synthetic and self-contained overview, Hugues Chate and Benoit Mahault
2. Why walking is easier than pointing: Hydrodynamics of dry active matter, John Toner
3. Collective Motion in Active Materials: Model Experiments, Olivier Dauchot
4. Features of interfaced and confined experimental active nematics, Francesc Sagues, Pau Guillamat, Jérôme Hardoüin, Berta Martinez-Prat, and Jordi Ignés-Mullol
5. Phases of planar active matter, Leticia Cugliandolo and Giuseppe Gonnella
6. Active Field Theories, Michael E. Cates
Part 2: Passive & active colloidal systems
7. "Active brownian particles with programmable interaction rules", Celia Lozano, Tobias Bäuerle, and Clemens Bechinger
8. Phoretic Active Matter, Ramin Golestanian
9. Nanotribology of Commensurate and Incommensurate Colloidal Monolayers on Periodic Surfaces, Thorsten Brazda, Xin Cao, and Clemens Bechinger
Part 3: From biophysics to active matter
10. Tissues as active materials, Jean-François and Joanny Louis Brézin
11. Self-organisation of protein patterns, Erwin Frey and Fridtjof Brauns
12. Active materials: Biological benchmarks and transport limitations, Eric R. Dufresne
Part 4: Non-equilibrium statistical physics, from passive to active
13. Modelling the microscopic origins of active transport, Daan Frenkel
14. Fluctuation Induced Forces in and out of Equilibrium, Mehran Kardar
15. Active glassy materials, Ludovic Berthier and Jorge Kurchan
16. Forces in dry active matter, Ydan Ben Dor, Yariv Kafri, and Julien Tailleur
17. Rheology of complex and active fluids, Suzanne M. Fielding