Exhibit A
Joint Filing Agreement
The undersigned agree that this Schedule 13G, and all amendments thereto, relating to the Common Stock of OmniAmerican Bancorp, Inc. shall be filed on behalf of the undersigned.
| /s/ STEVEN R. GERBEL |
| Steven R. Gerbel |
| BROWN TROUT MANAGEMENT, LLC |
| Name: Steven R. Gerbel |
| Title: Managing Member |
