| **EXHIBIT              32.1**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
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|  **CERTIFICATION              PURSUANT TO**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|  **18              U.S.C. SECTION 1350,**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|  **AS              ADOPTED PURSUANT TO**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|  **SECTION              906 OF THE SARBANES-OXLEY ACT OF 2002**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
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| In              connection with the Quarterly Report of Atlas America Public #12-2003              Limited Partnership (the “Partnership”) on Form 10-QSB for the period              ended September 30, 2005 as filed with the Securities and Exchange              Commission on the date hereof (the “Report”), I, Freddie M. Kotek, Chief              Executive Officer of the Managing General Partner, certify, pursuant              to 18              U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of              2002, that: |
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|  (1)  The              Report fully complies with the requirements of section 13 (a) or 15              (d) of              the Securities Exchange Act of 1934; and                                                                                                                                                                                                                                                                                                                                                                                                                  |
|  (2)  The              information contained in the Report fairly presents, in all material              respects, the financial condition and results of operations                         of  the Partnership.                                                                                                                                                                                                                                                                                                              |
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|                                  By:    /s/              Freddie M. Kotek                                                                                                                                                                                                                                                                                                                                   |
|                Name:    Freddie              M. Kotek                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|  Title:                      Chief              Executive Officer                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|  Date:                November              14, 2005                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |