Pronunciation

Louis Sachar
Pronounced "sacker"
http://www.harpercollinschildrens.com/Kids/AuthorsAndIllustrators/ContributorDetail.aspx?CId=18323

Kate Dicamillo:
Kate De-ca-mill-o
Listen to the interview:
http://www.authorfanclubs.com/kate-dicamillo/extras.php?autoplay=y

Dan Gutman:
Dan Gutman (Gut rhymes with cut)
http://www.teachingbooks.net/pronounce.cgi?aid=588

Rick Riordan
RYE-r-don
http://www.bookbrowse.com/biographies/index.cfm?author_number=1545