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Quintiles Transnational Corp. and Subsidiaries

EXHIBIT 31.1

CERTIFICATION
Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Dennis B. Gillings, Ph.D., certify that:



|1. |  | I have reviewed this quarterly report on Form 10-Q/A of
Quintiles Transnational Corp.;                                                                                                                                                                                                                                        
|-- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|  
|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 quarterly 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 officers and I are
responsible for establishing and maintaining disclosure controls and
procedures (as defined in Exchange Act Rules 13a-14 and 15d-14) for
the registrant and we have:                                                                                                     



| | a. |  | designed such disclosure controls and procedures to
ensure that material information relating to the registrant,
including its consolidated subsidiaries, is made known to us by
others within those entities, particularly during the period in
which this quarterly report is being prepared;
| | -- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
| | b. |  | evaluated the effectiveness of the registrants
disclosure controls and procedures as of a date within 90 days
prior to the filing date of this quarterly report (the Evaluation
Date); and                                                                                                  
|
| | c. |  | presented in this quarterly report our conclusions about
the effectiveness of the disclosure controls and procedures based
on our evaluation as of the Evaluation Date;                                                                                                                        



|5. |  | The registrants other certifying officers and I have
disclosed, based on our most recent evaluation, to the registrants
auditors and the audit committee of registrants board of directors
(or persons performing the equivalent function):
|-- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | a. |  | all significant deficiencies in the design or operation
of internal controls which could adversely affect the registrants
ability to record, process, summarize and report financial data
and have identified for the registrants auditors any material
weaknesses in internal controls; and
| | -- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
| | b. |  | any fraud, whether or not material, that involves
management or other employees who have a significant role in the
registrants internal controls; and                                                                                                                                        

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|6. |  | The registrants other certifying officers and I have indicated
in this quarterly report whether or not there were significant
changes in internal controls or in other factors that could
significantly affect internal controls subsequent to the date of our
most recent evaluation, including any corrective actions with regard
to significant deficiencies and material weaknesses.
|-- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|                      |  |                          
|--------------------- |  | -------------------------
|Date: August 26, 2003 |  |                          
|                      |  | /s/  Dennis B.
Gillings  
|                      |  |                          
|                      |  | Dennis B. Gillings, Ph.D.
|                      |  | Chairman                 

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