You can create new Index templates for each author's entries or one Index template that shows them all.
By putting
CODE
<MTEntries author="AUTHORNAME">
mt tags here
</MTEntries>
this allows you to show just the entries for that author.
You might check out the tutorials for how I do it on TheRedKitchen:
MT hacks: Master Author Archives and the more advanced
MT hacks: Master Author Archive, MySQL versionPost back if you have more questions!
Kristine