This is the version I started with for my dissertation. I had to change the cls file to single space the title on the approval page and then return to double spacing for the author.
...
\begin{center}
\textbf{Title} \
\singlespacing
@title
\vspace{.2in}
\hrule
\vspace{.2in}
\textbf{By} \
\doublespacing@author
\vspace{.2in}
...
Contributors
title