Only Display Specific Author Role

First, I love your plug-in! It provides me the flexibility I always wanted to display author info.

Here’s an example of how it currently looks on my site (top of sidebar, left).

I created a ‘guest’ custom author role, and I want to add code on a separate line below author name and above the ‘time_ago’ to display the role only for authors assigned as ‘guest’.

Could anyone help me out?