SARBANES-OXLEY CERTIFICATION
HSI Asset Loan Obligation Trust 2007-AR1
Mortgage Pass-Through Certificates
Series 2007-AR1

            This Certification is being made pursuant to Section 3.05 and
Section 8.12 of the Pooling and Servicing Agreement dated as of January 1,
2007, (the "Pooling and Servicing Agreement") relating to the above
referenced Series,among HSI Asset Securitization Corporation, as depositor,
Wells Fargo Bank, N.A. as custodian, CitiMortgage, Inc., as master servicer,
Citibank, N.A., as securities administrator, and Deutsche Bank National Trust
Company, as trustee.  Capitalized terms used but not defined herein shall
have the meanings assigned in the Pooling and Servicing Agreement.

            1.  I have reviewed this annual 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 HSI Asset Loan Obligation Trust 2007-AR1
(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 master servicer and based on my knowledge and the compliance review
conducted in preparing the servicer compliance statement required in this
report under Item 1123 of Regulation AB, and except as disclosed in the
Exchange Act periodic reports, the master servicer has fulfilled its
obligations under the pooling and servicing agreement, 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 unafilliated parties: American
Home Mortgage Servicing Inc., as Servicer; Countrywide Home Loans LP, as
Servicer; HSBC Mortgage Corporation (USA), as Servicer; Residential Funding
Company, LLC, as Servicer;  Suntrust Mortgage, Inc, as Servicer; Wells Fargo
Bank, N.A., as Custodian;  First American Real Estate Solutions of Texas,
L.P., as sub-contractor for HSBC Mortgage Corporation;  SunTrust Bank, as
sub-contractor for SunTrust Mortgage, Inc.; ZC Sterling Insurance Agency,
Inc., as sub-contractor for SunTrust Mortgage, Inc.;  Homecomings Financial
LLC, as Sub-Servicer for Residential Funding Company, LLC;  and, GMAC
Mortgage LLC, as Sub-Servicer for Residential Funding Company, LLC.



      CITIMORTGAGE, INC.
      as Master Servicer

By: /s/ Tommy Harris
   ------------------------
Name:   Tommy Harris
Title:  Master Servcing Division Senior Vice President
        (senior officer in charge of the servicing function of the master
        servicer)

Date:     March 28, 2008