tedster - 1:03 am on Jul 11, 2012 (gmt 0)
There's a lot of documentation around. Here's some Google documentation: [support.google.com...]
Essentially, your authors should each have a Google+ profile page with a decent "head shot" thumbnail - and then you use the re;="author" markup on their articles to indicate who they are. The head shot can end up being used in the SERPs when their article ranks for a query. That can really boost clickthrough!
There are some slightly more complex situations when authors are published on more than one website - but it's still a relatively simple process.