Exhibit 31.1
Certification Pursuant to Section 240.13a-14 or 240.15d-14
of the Securities Exchange Act of 1934
I, Gustav A. Christensen, certify that: | |
1. | I have reviewed this Amendment No. 1 to quarterly report on Form 10-Q/A of Dyax Corp.; and |
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2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report. |
Date: | August 18, 2009 |
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| /s/ Gustav A. Christensen |
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| Gustav A. Christensen |
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| Chief Executive Officer |
