3Easy Last Editor is an EE2 Extension adding a {last_editor} tag to the channel entries loop. Each time an entry is submitted the last editor is updated with the logged in member’s screen name. The tag defaults to {author} for new entries.

1. Download the latest Github/3Easy/LastEditor version.
2. Copy the folder contents to ‘/system/expressionengine/third_party/last_editor’.
3. In the Control Panel, navigate to Addons > Extensions and Enable

Thanks to James Smith for the EE1 inspiration and permission to recreate for EE2