For information on advantages for claiming Google Authorship of your blog content see:
Summary of what you are doing:
From your G+ profile, you identify yourself as a contributor to IBM developerWorks.
On your blog UI, you add a link to your G+ profile url, with the parameter ?rel=author appended to the end. This tells Google that the individual(s) associated with the referenced G+ profile is the originator of the blog content. When Google crawls and indexes your blog content, it associates your G+ profile data as the author or owner of that content.
Because the dW blog UI can be modified at the blog level (rather than the blog entry level), each blog can only have one owning G+ profile. If you have multiple blog authors, consider creating a group G+ profile (rather than an individual G+ profile) so you can, as a group, claim ownership of the blog.
How to do it
Step 1: Create a G+ profile
Step 2: On your Google+ profile, add IBM developerWorks as a Contributor link.
Step 3: From the Blog Settings, select "Templates" in the lower lefthand navigation
Step 4: Open up the "Weblog" template.
Step 5: Determine if your existing Weblog template has Share links already added, search for "<div class="ibm-container dw-blog-share">"
If you find this section in your Weblog template, you can add the G+ profile link here (exchanging your unique profile id with the example id):
<li><a title="Google" href="http://plus.google.com/102715379022391447857/?rel=author" class="dw-blog-google-share-link">$text.get("mydw.minimal.shareWidgetGoogle")</a></li>
If you do not find this section in your Weblog template, add the following code to your right hand column div tag:
<img src="https://ssl.gstatic.com/images/icons/gplus-29.png" alt="Find me on Google+" /></a></p>
Step 6: To verify the Google is able to read the authorship, go to the Rich Snippets Test Page and enter your blog url (or any blog post url). Click "Preview." If Google is able to read your author markup, you will get a message that "Authorship is working for this webpage."