A range of different attestations are available at CERN, both for current and ex-members of the personnel.
How you can obtain these attestations will vary according to the type of attestation and your employment status. All the requests are available via the Service Portal:
N.B.: If you are about to leave CERN, you must provide an external email address in the Account Management Portal. If you do not do this, the Service Desk or Attestations Service will need to perform additional steps in order to verify your identity, requiring you to send a scanned copy of your identity card or passport.