A friend and fellow blogger, Bill Slawski of SEO by The Sea, has written many articles relating to this subject. His post, are you trusted by Google contains good information and many links to other articles he has written on the subject. I highly recommend his blog if you are into advanced SEO and Google patents.
One more thing before we start. The web is a fast changing place. Information can quickly become out of date as things change. I found this out when looking for information on this very subject. Here’s a little tip to help find up to date information on any subject, fast.
When you carry out a search for information. Try adding the year or even month and year to your search.
Example:- ( How To Set Up Google Authorship Markup On WordPress 2012 ).
Setting Up Google Authorship Markup In WordPress
Step 1 – WordPress Author Bio
In the WordPress admin area – Go to users and select – (Your Profile) from the left hand sidebar.
Change the first name and last name fields to EXACTLY match the first and last name of your Google Plus profile.
Add your web address and email address to the appropriate fields.
Copy the following code. Then paste it into the box marked Biographical Info
<a href=”https://plus.google.com/ YOURGOOGLE ID/about”>+Steve Hippel</a> finish your biographical information by telling users about yourself here.
Change the name (Steve Hippel) to EXACTLY match that of your first and last name in Google plus. Make sure that you leave the + sign in front of your name. i.e (+Fred Bloggs).
In the code above, change the line of text (YOUR GOOGLE ID) to your Google plus id. You can find this by going to your google plus profile (NOT PAGE). Click on the profile icon and copy the number only from the address bar. Do not include any slashes, just the number.
In the code, change the text (finish your biographical information by telling users about yourself here), to suit your needs
Now save your author bio and exit the users section of WordPress.
Step 2 – Add your Google Plus button.
Copy the following code and replace the line of text YOUR GOOGLE ID with your Google id, as explained above.
<a rel=”author” href=”https://plus.google.com/YOUR GOOGLE ID/about”><img src=”http://www.google.com/images/icons/ui/gprofile_button-32.png” width=”32″ height=”32″></a> Visit me on Google+
Add this to a text widget or to the “page” and “single” templates in the WordPress editor, as appropriate. It is probably best to add it to a text widget if you are not familiar with the WordPress framework.
Optional – Change the line of text (Visit me on Google+) to whatever you want.
Step 3 – Setting Up Google plus.
Go to your G+ account and select profile – then edit profile.
On the right of the page:-
Select (contributor to) – then -( add custom link). Add your blog, homepage address as a custom link and click save.
Repeat the steps above for (other profiles) also on the right, just above (contributor to).
Fill out as much of the information as you can on the edit profile page. Add a profile picture as this will show up in some searches.
You are now done with the setup.
Step 4 – Testing
If you Have A Google Webmaster Tools Account Set Up:-
Go to google webmaster tools and on the left hand side select (Other resources)
Click on the (rich snipets testing tool) and paste your homepage url in the text field.
Click on preview.
If all is OK you should see your profile picture next to a bogus search result.
Any errors or warnings will be shown below in red.
If You Do Not Have A Google Webmaster Tools Account:-
Test your link here Rich Snipets Testing Tool
That’s it, your authorship is now set up.