\documentclass[t,14pt,notheorems]{beamer}
\usetheme{mjo}

\usepackage{amsmath, mathtools}
\usepackage{mjotex}

\title{Example presentation}
\author{Michael Orlitzky}
\date{Somewhere, on a day}

\begin{document}
  \begin{frame}
    \titlepage
  \end{frame}

  \begin{part}{Part one}
    \begin{section}{Section one}
      \begin{frame}
        Hello, these are bullet points:
        \begin{itemize}
          \begin{item}
            Item one
          \end{item}
          \begin{item}
            Item two
          \end{item}
          \begin{item}
            Et cetera
          \end{item}
        \end{itemize}
      \end{frame}
    \end{section}

    \begin{section}{Section two}
      \begin{frame}
        Much slide

        \begin{theorem*}
          This is a theorem.
          \begin{proof}
            And its proof.
          \end{proof}
        \end{theorem*}
      \end{frame}
      \begin{frame}
        So presentation
      \end{frame}
    \end{section}
  \end{part}


  \begin{part}{The other part}
    \begin{section}{Section three}
      \begin{frame}
        You get the idea
      \end{frame}
    \end{section}
  \end{part}


  \begin{section}{Section four (no part)}
    \begin{frame}
      Everybody gets a free slide!
    \end{frame}
  \end{section}
\end{document}
