Deutsche Alt-A Securities Mortgage Loan Trust, Series 2007-AR1 – ‘10-K’ for 12/31/07 – ‘EX-31’

On:  Thursday, 3/27/08, at 5:08pm ET   ·   For:  12/31/07   ·   Accession #:  1056404-8-900   ·   File #:  333-131600-12

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Annual Report   —   Form 10-K
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Annual Report                                          9±    42K 
 3: EX-33       ABS - Report of Compliance with Servicing Criteria     9±    52K 
 4: EX-33       ABS - Report of Compliance with Servicing Criteria     3±    19K 
 5: EX-33       ABS - Report of Compliance with Servicing Criteria     8±    51K 
 6: EX-33       ABS - Report of Compliance with Servicing Criteria     7±    39K 
 7: EX-33       ABS - Report of Compliance with Servicing Criteria     2±    16K 
 8: EX-33       ABS - Report of Compliance with Servicing Criteria     2±    16K 
 9: EX-33       ABS - Report of Compliance with Servicing Criteria     2±    14K 
10: EX-34       ABS - Attestation Report on Assessment of              2±    14K 
                          Compliance with Servicing Criteria                     
11: EX-34       ABS - Attestation Report on Assessment of              2±    17K 
                          Compliance with Servicing Criteria                     
12: EX-34       ABS - Attestation Report on Assessment of              2±    15K 
                          Compliance with Servicing Criteria                     
13: EX-34       ABS - Attestation Report on Assessment of              2±    14K 
                          Compliance with Servicing Criteria                     
14: EX-34       ABS - Attestation Report on Assessment of              2±    15K 
                          Compliance with Servicing Criteria                     
15: EX-34       ABS - Attestation Report on Assessment of              2±    15K 
                          Compliance with Servicing Criteria                     
16: EX-34       ABS - Attestation Report on Assessment of              2±    13K 
                          Compliance with Servicing Criteria                     
17: EX-35       ABS - Servicer Compliance Statement                    6±    30K 
18: EX-35       ABS - Servicer Compliance Statement                    3±    20K 
19: EX-35       ABS - Servicer Compliance Statement                    3±    17K 
 2: EX-31       Certification -- Sarbanes-Oxley Act - Sect. 302        1     11K 

EX-31   —   Certification — Sarbanes-Oxley Act – Sect. 302

EX-31 Rule 13a-14(d)/15d-14(d) Certification.                               

I, Kristen Ann Cronin, 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 Deutsche Alt-A Securities Mortgage Loan Trust, Series      
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            
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:       
Countrywide Home Loans Servicing LP as Servicer, GMAC Mortgage, LLC     
f/k/a GMAC Mortgage Corporation as Servicer, GreenPoint Mortgage        
Funding, Inc. as Servicer, and IndyMac Bank, F.S.B. as Servicer.        

Dated:   March 27, 2008                                                 

/s/ Kristen Ann Cronin                                                  
Signature                                                               

Vice President                                                          
(senior officer in charge of the servicing function of the master       
servicer)                                                               

Dates Referenced Herein

This ‘10-K’ Filing		Date		Other Filings
Filed on:		3/27/08		None on these Dates
For Period End:		12/31/07
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