There are a lot of bloated plugins that will include data into your RSS feed... but it's simple to do with minimal code.
Copy and paste the WordPress function into your theme's functions.php
file or, if you sensibly have one installed, your custom functions plugin.
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<?php
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/*
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Author Details in WP RSS Feed
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http://www.beliefmedia.com/code/wp-snippets/author-rss-feed
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*/
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function beliefmedia_author_rss_feed($content) {
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/* $description = get_the_author_description(); */
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$content .= "
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Post written by $author
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";
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}
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return $content;
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}
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While the code relates to printing the author name, any detail can be concatenated to the RSS text.