| 1. | I      have reviewed this quarterly report on Form 10-Q of inVentiv Health,      Inc.; |
|----|---------------------------------------------------------------------------------------------|

| 2. | Based      on my knowledge, this quarterly 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 quarterly report; |
|----|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| 3. | Based      on my knowledge, the financial statements, and other financial information      included in this report, fairly present in all material respects the      financial condition, results of operations and cash flows of the      registrant as of, and for, the periods presented in this quarterly      report; |
|----|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| 4. | The      registrant’s other certifying officer and I are responsible for      establishing and maintaining disclosure controls and procedures (as      defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal      control over financial reporting (as defined in Exchange Act      Rules 13a-15(f) and 15d-15(f)) for the registrant and      have: |
|----|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| 5. | The      registrant’s other certifying officer and I have disclosed, based on our      most recent evaluation of internal control over financial reporting, to      the registrant’s auditors and the audit committee of the registrant’s      board of directors (or persons performing the equivalent      functions): |
|----|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|   | a) | All      significant deficiencies and material weaknesses in the design or      operation of internal controls over financial reporting which are      reasonably likely to adversely affect the registrant’s ability to record,      process, summarize and report financial  information. |
|--------|----|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|          b)   | Any      fraud, whether or not material, that involves management or other      employees who have a significant role in the registrant’s internal control      over financial reporting. |
|----------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|                | inVentiv Health,      Inc. |                                                                          |
|---------------------|----------------------------|-------------------------------------------------------------------------------|
|                |                       |                                                                          |   |
| August      8, 2008 | By:                        | /s/ R.      Blane Walter         |   |
|                |                       | R.      Blane Walter                                                     |   |
|                |                       | Chief      Executive Officer                                                  |   |
|                |                       |                                                                          |   |