\documentclass{beamer}
\usetheme{Singapore}
\usepackage{graphicx}
\usepackage[greek,english]{babel}
\usepackage{alphabeta}
\begin{document}
\title{Fourier Series}
\institute{University of Ioannina}
\date{\today}
\begin{frame}
\maketitle
\end{frame}

\begin{frame}
\frametitle{Biography}
\begin{center}
\includegraphics[height=3cm]{joseph-fourier}
\end{center}
\end{frame}

\end{document}                                                                      
