%\tracingall
\documentstyle[resume]{article}

\begin{document}

\employer{John McKeesh Industries, Ltd.}
\begin{itemize}\makeatletter\@topsep\itemsep\itemsep0pt\parsep0pt\makeatother
\item foo
\item bar
\end{itemize}

\topsep0pt\partopsep0pt\parsep0pt\parskip0pt\itemsep0pt
\employer{John McKeesh Industries, Ltd.}\makeatletter
\begin{itemize}\showthe\topsep\showthe\partopsep\showthe\@topsep
\item foo
\item bar
\end{itemize}

\end{document}



