Exhibit 31(ii)
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                                CERTIFICATIONS
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      I, Steve Bailey, certify that:

               1.   I have reviewed this report on Form 10-K and all reports
                    on Form 10-D required to be filed in respect of the period
                    covered by this report on Form 10-K of CHL Mortgage
                    Pass-Through Trust 2007-HY4 (the "Exchange Act periodic
                    reports");

               2.   Based on my knowledge, the Exchange Act periodic reports,
                    taken as a whole, do 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, all of the distribution, servicing
                    and other information required to be provided under Form
                    10-D for the period covered by this report is included in
                    the Exchange Act periodic reports;

               4.   I am responsible for reviewing the activities performed by
                    the servicer(s) and based on my knowledge and the
                    compliance review(s) conducted in preparing the servicer
                    compliance statement(s) required in this report under Item
                    1123 of Regulation AB, and except as disclosed in the
                    Exchange Act periodic reports, the servicer(s) have
                    fulfilled their obligations under the servicing
                    agreement(s) in all material respects; and

               5.   All of the reports on assessment of compliance with
                    servicing criteria for asset-backed securities and their
                    related attestation reports on assessment of compliance
                    with servicing criteria for asset-backed securities
                    required to be included in this report in accordance with
                    Item 1122 of Regulation AB and Exchange Act Rules 13a-18
                    and 15d-18 have been included as an exhibit to this
                    report, except as otherwise disclosed in this report. Any
                    material instances of noncompliance described in such
                    reports have been disclosed in this report on Form 10-K.

               In giving the certifications above, I have reasonably relied on
               information provided to me by the following unaffiliated
               parties: The Bank of New York, as Trustee.

      Date: March 25, 2008

                  /s/ Steve Bailey
                  --------------------------------
                  Steve Bailey
                  Senior Managing Director, Chief Executive Officer Loan
                  Administration
                  (Senior officer in charge of the servicing function of
                  Countrywide Home Loans Servicing LP)