Code:
<p class="letterBoldInd" xml:lang="en-us" xmlns:xml="http://www.w3.org/XML/1998/namespace">Author:
<span class="letter" xml:lang="en-us" xmlns:xml="http://www.w3.org/XML/1998/namespace"><i>Mr. Andrew McCurdy:</i> A lifelong bibliophile, ... </span></p>
might work. IMHO spans are a good way to do style changes