change it to
and you'll be fine.
The encoding warning is most like caused during copy/paste. If you look at view-source you'll see a "box" before
which is most likely the BOM (byte order mark) that some text editors insert. If you copy/paste using only a plain text editor (eg. Notepad not Word) you should be able to avoid this problem in the future.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
Compare with the bio page's view-source which doesn't have the box and does validate.