Check Preferences / Java / Code Style / Code Template
Section Comment / Type
You can replace the author tag by whatever value you need and it will have an effect on new generated classes.

However, if the template is fine, but the value referenced buy the author tag is not, see this SO question:
${user} uses the value of the user.name environment variable; therefore, you can pass -Duser.name=My Name in eclipse.ini to override it.
Or, if you prefer, you can modify the shortcut to point to:
C:/java/eclipse/eclipse.exe -vmargs -Duser.name="cleverUserNameToUseInSourceCode"
- MacOs: Aram Kocharyan mentions the
eclipse.iniis inEclipse.app/Contents/MacOS/if you right click and go Show Package Content. - ZendStudio: rofflox comments the file is named
ZendStudio.iniand is found inApplications/Zend Studio.app/Contents/MacOS/.