EXHIBIT A JOINT FILING AGREEMENT
EXHIBIT A
The undersigned hereby agree that the statement on Schedule 13D, Amendment No. 7, with respect
to the Common Stock of Sterling Chemicals, Inc. dated as of March 5, 2008 is, and any amendments
thereto (including amendments on Schedule 13G) signed by each of the undersigned shall be, filed on
behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k) under the
Securities Exchange Act of 1934, as amended.
| Date: Xxxxx 0, 0000 | XXXXXXXXXX XXXXX MANAGEMENT, L.L.C. | |||||
| By: | /s/ Xxxxxx X. Xxxx | |||||
| Name: | ||||||
| Title: | Chairman and Chief Executive Officer | |||||
| RESURGENCE ASSET MANAGEMENT, INTERNATIONAL L.L.C. | ||||||
| By: | /s/ Xxxxxx X. Xxxx | |||||
| Name: | ||||||
| Title: | Chairman and Chief Executive Officer | |||||
| RE/ENTERPRISE ASSET MANAGEMENT, L.L.C. | ||||||
| By: | /s/ Xxxxxx X. Xxxx | |||||
| Name: | ||||||
| Title: | Chairman and Chief Executive Officer | |||||
| M.D. SASS MANAGEMENT, INC. | ||||||
| By: | /s/ Xxxxxx X. Xxxx | |||||
| Name: | ||||||
| Title: | Chairman and Chief Executive Officer | |||||
| XXXXXX X. XXXX | ||||||
| /s/ Xxxxxx X. Xxxx | ||||||
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