Exhibit 31.3
CERTIFICATIONS
I, John P. McLaughlin, President and Chief Executive Officer of PDL BioPharma, Inc., certify that:
(1) I have reviewed this Quarterly Report on Form 10-Q/A of PDL BioPharma, Inc.; and
(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: May 5, 2009 |
| /s/ John P. McLaughlin |
| John P. McLaughlin |
President and Chief Executive Officer (Principal Executive Officer) |