body {
  text-align:center;
}

table {
    border-collapse:collapse;
}

table.table {
    clear:both;
    border-collapse:collapse;
    border-top: 1px solid #666;
    margin: 20px 0 5px 0;
    width:100%;*/
    font: 0.85em;
}

table.beirat_l, table.beirat_r,{
margin: 25px auto 25px auto;
display:inline-table;
float: left;
}

<table class="beirat_l">
<tbody>
<tr>
    <td>
    <img alt="Dr. Heiko Breit" class="img-responsive" height="241" src="http://kloss.biz/media/pics/Dr.-Heiko-Breit.jpg" style="" width="254" /></td>
</tr>
<tr>
    <td>Dr. Heiko Breit</td>
</tr>
</tbody>
</table>

<table class="beirat_r">
<tbody>
<tr>
    <td>
    <img alt="Dr. Heiko Breit" class="img-responsive" height="241" src="http://kloss.biz/media/pics/Dr.-Heiko-Breit.jpg" style="" width="254" /></td>
</tr>
<tr>
    <td>Dr. Heiko Breit</td>
</tr>
</tbody>
</table>