EXHIBIT A JOINT FILING AGREEMENT
EXHIBIT A
JOINT FILING AGREEMENT
JOINT FILING AGREEMENT
The undersigned hereby agree that this Schedule 13G with respect to the shares of common
stock of Key Energy Services, Inc., dated as of July 19, 2007, is, and any amendments thereto
(including amendments on Schedule 13D) signed by each of the undersigned shall be, filed on behalf
of each of the undersigned pursuant to and in accordance with the provisions of Rule 13d-1(k) under
the Securities Exchange Act of 1934.
Date: July 19, 2007
MHR FUND MANAGEMENT LLC |
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By: | /s/ Xxx Xxxxxxxxx | |||
Name: | Xxx Xxxxxxxxx | |||
Title: | Vice President | |||
XXXX X. XXXXXXXX, M.D. |
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By: | /s/ Xxx Xxxxxxxxx, as attorney-in-fact | |||