On article page
<meta name="Author" content="Ken Van Gilbergen" />
<a rel=”author” href=”https://ken.be/wie-is-ken-van-gilbergen”>Ken Van Gilbergen</a>
On author page
<a rel="me" href="https://plus.google.com/103529818965767589982">Ken Van Gilbergen</a>
<a rel="me" href="https://ict.ken.be">ict.ken.be</a>
(all author pages should link back to each other)
Testing: http://www.google.com/webmasters/tools/richsnippets