Exhibit 31.1
CERTIFICATIONS
I, Hans E. Bishop, certify that:
| 1. | I have reviewed this Amendment No. 1 to the Quarterly Report on Form 10-Q of Juno Therapeutics, 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: November 23, 2015
/s/ Hans E. Bishop |
| Hans E. Bishop |
President and Chief Executive Officer (Principal Executive Officer) |
