table(table table-bordered table-condensed).
|_. Attribute|_. Type|_. Description|_. Example|
|email|string|||
+|username|string|The username used for the user's git repositories and virtual machine logins. Usernames must start with a letter, and contain only alphanumerics. When a new user is created, a default username is set from their e-mail address. Only administrators may change the username.||
|first_name|string|||
|last_name|string|||
|identity_url|string|||
|prefs|hash|||
|default_owner_uuid|string|||
|is_active|boolean|||
+|writable_by|array|List of UUID strings identifying Groups and other Users that can modify this User object. This will include the user's owner_uuid and, for administrators and users requesting their own User object, the requesting user's UUID.||