**Exhibit 31.1**

 

Certification of Principal Executive Officer

Pursuant to Rule 13a-14(a) under theSecurities Exchange Act of 1934

 

I, Michael J. Mauceli, certify that:

 

1.               I have reviewedthis Annual Report on Form 10-K of Reef Global Energy VI, L.P. for thefiscal year ended December 31, 2008;

 

2.               Based on myknowledge, this annual report does not contain any untrue statement of amaterial fact or omit to state a material fact necessary to make the statementsmade, in light of the circumstances under which such statements were made, notmisleading with respect to the period covered by this report;

 

3.               Based on myknowledge, the financial statements, and other financial information includedin this report, fairly present in all material respects the financialcondition, results of operations and cash flows of the registrant as of, andfor, the periods presented in this report;

 

4.     The registrant’s othercertifying officer(s) and I are responsible for establishing andmaintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and15d-15(e)), and internal control over financial reporting (as defined inExchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant andhave:

 

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

 

b)             Designed such internal control over financialreporting, or caused such internal control over financial reporting to bedesigned under our supervision, to provide reasonable assurance regarding thereliability of financial reporting and the preparation of financial statementsfor external purposes in accordance with generally accepted accountingprinciples;

 

c)              Evaluated the effectiveness of the registrant’sdisclosure controls and procedures and presented in this report our conclusionsabout the effectiveness of the disclosure controls and procedures, as of theend of the period covered by this report based on such evaluation; and

 

d)             Disclosed in this report any change in the registrant’sinternal control over financial reporting that occurred during the registrant’sfourth fiscal quarter that has materially affected, or is reasonably likely tomaterially affect, the registrant’s internal control over financial reporting.

 

5.               The registrant’sother certifying officer and I have disclosed, based on our most recentevaluation of internal control over financial reporting, to the registrant’sauditors and the audit committee of registrant’s board of directors (or personsperforming the equivalent functions):

 

a)              All significant deficiencies and material weaknessesin the design or operation of internal control over financial reporting whichare 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 involvesmanagement or other employees who have a significant role in the registrant’sinternal control over financial reporting.

 
| Date:  April 15, 2009 | By:    | Reef  Oil & Gas Partners, L.P.    |
|----------------------------|--------|--------------------------------------------|
|                       |   | Managing  General Partner                  |
|                       |   |                                       |
|                       | By:    | Reef  Oil & Gas Partners, GP, LLC |
|                       | By:    | /s/  Michael J. Mauceli                    |
|                       |   | Michael  J. Mauceli                        |
|                       |   | Manager  and Member                        |
|                       |   | (Principal  Executive Officer)             |

 

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