The workshop ɣ in Z will take place at ITP Zurich from November 16 to 20, 2009. It consists of a week long collaboration meeting in the framework of a Fermi guest investigator grant titled “Anisotropy and energy spectrum of the Gamma-ray Background as probes of Dark Matter and Astrophysical sources”, and of a one-day workshop, on Wednesday 18. More information can be found at http://www2.iap.fr/users/bertone/GinZ.