Exhibit 31.1
THERMO FISHER SCIENTIFIC INC.
CERTIFICATION REQUIRED BY EXCHANGE ACT RULES 13a-14(a) and 15d-14(a),
AS ADOPTED PURSUANT TO
SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002
I, Marc N. Casper, certify that:
| 1. | I have reviewed this Amendment No. 1 to the Annual Report on Form 10-K of Thermo Fisher Scientific 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: February 28, 2013
| | /s/ Marc N. Casper |
| | Marc N. Casper President and Chief Executive Officer |
