This plugin allows WordPress-driven websites with multiple authors to properly claim authorship, linking each individual writer to their associated Go
The plugin configures your blog so that Google will incorporate your authorship information when it indexes your pages. But that can take days, weeks or even months. If you want to test out to see if your authorship is working properly, test out various pages in Google's Rich Snippet Testing Tool.
Yes, Google runs everything through the Google+ profile pages. You don't have to actively use Google+ but you at least need to create your profile page and link up the domain names of the websites that you write for.