For Jedi Outcast IMDB.com says:
Quote:
Kenn Hoekstra manual
Michael Stemmle script
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Thought later Peter Tieryas is also credited as "manual writer."
Via the same source, for Jedi Academy it says:
Kenn wrote the manual again, but it isn't more specific for that.
Sometimes the official strategy guides cover this stuff, otherwise try the in-game credits.