Exhibit 31.1

RFMC WILLOWBRIDGE FUND L.P.            CERTIFICATION

 

|   | I, Robert Lerner, certify that:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
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| 1)     | I have reviewed this quarterly report for: RFMC                            Willowbridge Fund, L.P. 2)Based on my knowledge, this report does not                            contain any untrue statement or a material fact or omit to state a                            material part 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; |
| 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 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-15(e) and                            15d-15(e)) for the registrant and have:                                                                                                                                                                                                         |
|   | a)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | designed such disclosure controls and procedures, or                            caused such disclosure controls and procedures to be designed under our                            supervision, to ensure that material information relating to the                            registrant is made known to us by others within those entities,                            particularly during the period in which this report is being                            prepared; |
|   | b)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | evaluated the effectiveness of the registrant’s                            disclosure controls and procedures and presented in this report our                            conclusions about the effectiveness of the disclosure controls and                            procedures, as of the end of the period covered by this report based on                            such evaluation; and |
|   | c)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | disclosed in this report any change in the                            registrant’s internal control over financial reporting that                            occurred during the registrant’s roost recent fiscal quarter that                            has materially affected, or is reasonably likely to materially affect,                            the registrant’s internal control over financial reporting;                            and |
| 5)     | The registrant’s other certifying officers 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 control over financial reporting                            which are reasonably likely to adversely affect the registrant’s                            ability to record, process, summarize and report financial information;                            and |
|        | 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. |

 

| Date: August 14, 2008 | By:   /s/ Robert L.                            Lerner                                                                         |
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|                  | President, Principal Executive Officer and Principal                            Financial Officer of Ruvane Fund Management Corporation the general                            partner of RFMC Willowbridge Fund L.P.                                                                                                                                                                                                                                                                                           |