Mervin Praison

This plugin helps you add Google authorship markup to your WordPress site, allowing your Google Plus profile picture to appear in Google Search results.
Features: 
* Easy 4-step setup process 
* Multiple author support 
* Multisite compatible 
* Shortcode support

WP Google Authorship

Nice

Google Plus Profile Picture appear in Google Search. Very Easy to implement. Including Google authorship for multiple authors and multisite.

mlazarov

Google Plus Profile Picture appear in Google Search. Integrate Google Plus Profile with WordPress. Make your website come up in Google.
Including Google authorship for multiple authors and for wordpress multisite
Just 3 easy steps to process: 
1. Plugin Installation 
2. Enter Google Profile URL in Profile Page 
3. Post a link back from Google Plus Profile to Your Current Website

Google Plus Authorship

Add Google Plus Profile Picture to Google Search Results. Very Easy to implement! Google authorship for multiple authors

WP Google Authorship vs Google Plus Authorship