| add_user_meta() | Adds meta data to a user. |
| delete_user_meta() | Remove metadata matching criteria from a user. |
| get_the_author_meta() | Retrieves the requested data of the author of the current post. |
| get_user_meta() | Retrieve user meta field for a user. |
| the_author_meta() | Outputs the field from the user's DB object. Defaults to current post's author. |
| update_user_meta() | Update user meta field based on user ID. |