If you only want it at one page you can place some nodes and enter some text in it.
Example with boxes draw:

And without the boxes:

MWE (without boxes drawn)
\documentclass{article}
\usepackage{tikz}
\author{Roald}
\title{Header test}
\begin{document}
\maketitle
\tikzstyle{header} = [minimum height=2 cm, minimum width=2 cm, text width=1.5 cm, align=center]
\begin{tikzpicture}[remember picture, overlay]
\node[header, below right] at (current page.north west) {Left text. An then some.};
\node[header, below left] at (current page.north east) {Right text. And then some};
\end{tikzpicture}
\end{document}