Exhibit 31.1

                          THE WILLOWBRIDGE FUND, L.P.

                    Rule 13a-14(a)/13d-14(a) Certifications

I, Robert L. Lerner, certify that:

1)    I have reviewed this report on Form 10-K of The Willowbridge Fund, L.P.

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;

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)    I am responsible for establishing and maintaining disclosure controls
      and procedures (as defined in Exchange Act Rules 13a-14 and 15d-14) and
      internal control over financial reporting (as defined in Exchange Act
      Rules 13a-15(f) and 15d015(f)) for the registrant and I have:

      a)   designed such disclosure controls and procedures, or caused such
           disclosure controls and procedures to be designed under my
           supervision, to ensure that material information relating to the
           registrant, including its consolidated subsidiaries, is made known
           to me by others within those entities, particularly during the
           period in which this report is being prepared;

      b)   designed such internal control over financial reporting, or caused
           such internal control over financial reporting to be designed under
           my supervision, to provide reasonable assurance regarding the
           reliability of financial reporting and the preparation of financial
           statements for external purposes in accordance with generally
           accepted accounting principles;

      c)   evaluated the effectiveness of the registrant's disclosure
           controls and procedures and presented in this report my 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

      d)   disclosed in this report any change in the registrant's internal
           control over financial reporting that occurred during the
           registrant's fourth fiscal quarter that has materially affected, or
           is reasonably likely to materially affect, the registrant's
           internal control over financial reporting; and

5)    I have disclosed, based on my 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 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


                                              By: /s/ Robert L. Lerner
                                              -------------------------------
                                              Robert L. Lerner, President of
                                              Ruvane Investment Corporation

Date:  March 18, 2005