Authorship is key to establishing your social proof. Everything you post on your site, blog, other sites and social platforms can contribute to your Authorship. By linking all your great content you ensure that Google builds a body of work all attributable to you and establishing your credibility as an expert source.
Link to your Google+ profile using rel=”author”
The easiest and most reliable way to enable authorship information in Google search results is to provide a verified email address on the same domain as your content. If you don’t have an email address on the same domain, however, you can associate your content with your Google+ profile by following the steps on this page.
Linking your content to your Google profile is a two-step process. First, you add a link from your website or page to your Google profile. Second, you update your Google profile by adding a link back to your site.
1. Link your content to your Google profile
Create a link to your Google+ profile from your webpage, like this:
Replace [profile_url] with the your Google Profile URL, like this:
Click the Contributor To section on the right (depending on how many photos you have, you may need to scroll to see this section), and then click Add custom link.
If you want, change the visibility of your link, and then click Save.
To check your markup and see what author data Google can extract from your page, use the structured data testing tool. The tool only looks at a single page, so for now, you’ll need to check author pages and content pages separately to see if they are linking to each other correctly.
Google doesn’t guarantee to show author information in Google Web Search or Google News results.