Preface to special issue in memory of Kirill C. H. Mackenzie: Part I
Iakovos Androulidakis, Henrique Bursztyn, Juan-Carlos Marrero and Alan Weinstein

Book review: General theory of Lie groupoids and Lie algebroids, by Kirill C. H. Mackenzie
Theodore Voronov

Symplectic Zn2-manifolds
Andrew James Bruce and Janusz Grabowski

On twistor almost complex structures
Michel Cahen, Simone Gutt and John Rawnsley

Schwinger's picture of quantum mechanics: 2-groupoids and symmetries
Florio M. Ciaglia, Fabio Di Cosmo, Alberto Ibort, Giuseppe Marmo and Luca Schiavone

Local and global integrability of Lie brackets
Rui L. Fernandes and Yuxuan Zhang

On the history of Lie brackets, crossed modules, and Lie-Rinehart algebras
Johannes Huebschmann

Transitive double Lie algebroids via core diagrams
Madeleine Jotz Lean and Kirill C. H. Mackenzie

From Schouten to Mackenzie: Notes on brackets
Yvette Kosmann-Schwarzbach

Local convexity for second order differential equations on a Lie algebroid
Juan Carlos Marrero, David Martín de Diego and Eduardo Martínez

Brackets by any other name
Jim Stasheff