1 EXHIBIT 24 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the "Company"), proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, an annual report on Form 10-K; and WHEREAS, the undersigned is both a director and an officer of the Company, as indicated below his signature: NOW, THEREFORE, the undersigned hereby constitutes and appoints R. W. MILLER, M. B. TART and S. L. PRENDERGAST, and each of them, as attorney for him and in his name, place and stead, and in his capacity as both a director and an officer of the Company, to execute and file such annual report, and thereafter to execute and file any amendments or amendments thereto, hereby giving and granting to said attorneys, and each of them, full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and about the premises, as fully, to all intents and purposes, as he might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof. IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney this 19th day of February 1996. R. E. Allen Chairman of the Board and Director 2 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the "Company"), proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, an annual report on Form 10-K; and WHEREAS, the undersigned is an officer of the Company, as indicated below his signature: NOW, THEREFORE, the undersigned hereby constitutes and appoints M. B. TART and S. L. PRENDERGAST, and each of them, as attorneys for him and in his name, place and stead, and in his capacity as an officer of the Company, to execute and file such annual report, and thereafter to execute and file any amendments or amendments thereto, hereby giving and granting to said attorneys, and each of them, full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and about the premises, as fully, to all intents and purposes, as he might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof. IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney this 14th day of February, 1996. R. W. Miller Senior Executive Vice President and Chief Financial Officer 3 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the "Company"), proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, an annual report on Form 10-K; and WHEREAS, the undersigned is an officer of the Company, as indicated below her signature: NOW, THEREFORE, the undersigned hereby constitutes and appoints R. W. MILLER and S. L. PRENDERGAST, and each of them, as attorneys for her and in her name, place and stead, and in her capacity as an officer of the Company, to execute and file such annual report, and thereafter to execute and file any amendments or amendments thereto, hereby giving and granting to said attorneys, and each of them, full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and about the premises, as fully, to all intents and purposes, as she might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof. IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney this 19th day of February, 1996. M. B. Tart Vice President and Controller 4 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the "Company"), proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, an annual report on Form 10-K; and WHEREAS, the undersigned is a director of the Company: NOW, THEREFORE, the undersigned hereby constitutes and appoints R. W. MILLER, M. B. TART and S. L. PRENDERGAST, and each of them, as attorneys for him or her and in his or her name, place and stead, and in his or her capacity as a director of the Company, to execute and file such annual report, and thereafter to execute and file any amendments or amendments thereto, hereby giving and granting to said attorneys, and each of them, full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and about the premises, as fully, to all intents and purposes, as he or she might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof. IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney this 22nd day of February, 1996. Philip M.Hawley Director 5 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the "Company"), proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, an annual report on Form 10-K; and WHEREAS, the undersigned is a director of the Company: NOW, THEREFORE, the undersigned hereby constitutes and appoints R. W. MILLER, M. B. TART and S. L. PRENDERGAST, and each of them, as attorneys for him or her and in his or her name, place and stead, and in his or her capacity as a director of the Company, to execute and file such annual report, and thereafter to execute and file any amendments or amendments thereto, hereby giving and granting to said attorneys, and each of them, full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and about the premises, as fully, to all intents and purposes, as he or she might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof. IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney this 14th day of February, 1996. Carla A. Hills Director 6 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the "Company"), proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, an annual report on Form 10-K; and WHEREAS, the undersigned is a director of the Company: NOW, THEREFORE, the undersigned hereby constitutes and appoints R. W. MILLER, M. B. TART and S. L. PRENDERGAST, and each of them, as attorneys for him or her and in his or her name, place and stead, and in his or her capacity as a director of the Company, to execute and file such annual report, and thereafter to execute and file any amendments or amendments thereto, hereby giving and granting to said attorneys, and each of them, full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and about the premises, as fully, to all intents and purposes, as he or she might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof. IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney this 19th day of February, 1996. Belton K. Johnson Director 7 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the "Company"), proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, an annual report on Form 10-K; and WHEREAS, the undersigned is a director of the Company: NOW, THEREFORE, the undersigned hereby constitutes and appoints R. W. MILLER, M. B. TART and S. L. PRENDERGAST, and each of them, as attorneys for him or her and in his or her name, place and stead, and in his or her capacity as a director of the Company, to execute and file such annual report, and thereafter to execute and file any amendments or amendments thereto, hereby giving and granting to said attorneys, and each of them, full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and about the premises, as fully, to all intents and purposes, as he or she might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof. IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney this 14th day of February, 1996. Ralph S. Larsen Director 8 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the "Company"), proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, an annual report on Form 10-K; and WHEREAS, the undersigned is a director of the Company: NOW, THEREFORE, the undersigned hereby constitutes and appoints R. W. MILLER, M. B. TART and S. L. PRENDERGAST, and each of them, as attorneys for him or her and in his or her name, place and stead, and in his or her capacity as a director of the Company, to execute and file such annual report, and thereafter to execute and file any amendments or amendments thereto, hereby giving and granting to said attorneys, and each of them, full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and about the premises, as fully, to all intents and purposes, as he or she might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof. IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney this 19th day of February, 1996. Alex J. Mandl Director 9 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the "Company"), proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, an annual report on Form 10-K; and WHEREAS, the undersigned is a director of the Company: NOW, THEREFORE, the undersigned hereby constitutes and appoints R. W. MILLER, M. B. TART and S. L. PRENDERGAST, and each of them, as attorneys for him or her and in his or her name, place and stead, and in his or her capacity as a director of the Company, to execute and file such annual report, and thereafter to execute and file any amendments or amendments thereto, hereby giving and granting to said attorneys, and each of them, full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and about the premises, as fully, to all intents and purposes, as he or she might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof. IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney this 22nd day of February, 1996. Donald F. McHenry Director 10 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the "Company"), proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, an annual report on Form 10-K; and WHEREAS, the undersigned is a director of the Company: NOW, THEREFORE, the undersigned hereby constitutes and appoints R. W. MILLER, M. B. TART and S. L. PRENDERGAST, and each of them, as attorneys for him or her and in his or her name, place and stead, and in his or her capacity as a director of the Company, to execute and file such annual report, and thereafter to execute and file any amendments or amendments thereto, hereby giving and granting to said attorneys, and each of them, full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and about the premises, as fully, to all intents and purposes, as he or she might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof. IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney this 19th day of February, 1996. Victor A. Pelson Director 11 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the "Company"), proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, an annual report on Form 10-K; and WHEREAS, the undersigned is a director of the Company: NOW, THEREFORE, the undersigned hereby constitutes and appoints R. W. MILLER, M. B. TART and S. L. PRENDERGAST, and each of them, as attorneys for him or her and in his or her name, place and stead, and in his or her capacity as a director of the Company, to execute and file such annual report, and thereafter to execute and file any amendments or amendments thereto, hereby giving and granting to said attorneys, and each of them, full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and about the premises, as fully, to all intents and purposes, as he or she might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof. IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney this 14th day of February, 1996. Donald S. Perkins Director 12 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the "Company"), proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, an annual report on Form 10-K; and WHEREAS, the undersigned is a director of the Company: NOW, THEREFORE, the undersigned hereby constitutes and appoints R. W. MILLER, M. B. TART and S. L. PRENDERGAST, and each of them, as attorneys for him or her and in his or her name, place and stead, and in his or her capacity as a director of the Company, to execute and file such annual report, and thereafter to execute and file any amendments or amendments thereto, hereby giving and granting to said attorneys, and each of them, full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and about the premises, as fully, to all intents and purposes, as he or she might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof. IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney this 22nd day of February, 1996. Michael I. Sovern Director 13 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the "Company"), proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, an annual report on Form 10-K; and WHEREAS, the undersigned is a director of the Company: NOW, THEREFORE, the undersigned hereby constitutes and appoints R. W. MILLER, M. B. TART and S. L. PRENDERGAST, and each of them, as attorneys for him or her and in his or her name, place and stead, and in his or her capacity as a director of the Company, to execute and file such annual report, and thereafter to execute and file any amendments or amendments thereto, hereby giving and granting to said attorneys, and each of them, full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and about the premises, as fully, to all intents and purposes, as he or she might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof. IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney this 13th day of February, 1996. Franklin A. Thomas Director 14 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the "Company"), proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, an annual report on Form 10-K; and WHEREAS, the undersigned is a director of the Company: NOW, THEREFORE, the undersigned hereby constitutes and appoints R. W. MILLER, M. B. TART and S. L. PRENDERGAST, and each of them, as attorneys for him or her and in his or her name, place and stead, and in his or her capacity as a director of the Company, to execute and file such annual report, and thereafter to execute and file any amendments or amendments thereto, hereby giving and granting to said attorneys, and each of them, full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and about the premises, as fully, to all intents and purposes, as he or she might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof. IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney this 14th day of February, 1996. Thomas H. Wyman Director 15 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the "Company"), proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, an annual report on Form 10-K; and WHEREAS, the undersigned is a director of the Company: NOW, THEREFORE, the undersigned hereby constitutes and appoints R. W. MILLER, M. B. TART and S. L. PRENDERGAST, and each of them, as attorneys for him or her and in his or her name, place and stead, and in his or her capacity as a director of the Company, to execute and file such annual report, and thereafter to execute and file any amendments or amendments thereto, hereby giving and granting to said attorneys, and each of them, full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and about the premises, as fully, to all intents and purposes, as he or she might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof. IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney this 23rd day of February, 1996. M. Kathryn Eickhoff Director 16 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the "Company"), proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, an annual report on Form 10-K; and WHEREAS, the undersigned is a director of the Company: NOW, THEREFORE, the undersigned hereby constitutes and appoints R. W. MILLER, M. B. TART and S. L. PRENDERGAST, and each of them, as attorneys for him or her and in his or her name, place and stead, and in his or her capacity as a director of the Company, to execute and file such annual report, and thereafter to execute and file any amendments or amendments thereto, hereby giving and granting to said attorneys, and each of them, full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and about the premises, as fully, to all intents and purposes, as he or she might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof. IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney this 23rd day of February, 1996. Drew Lewis Director 17 POWER OF ATTORNEY KNOW ALL MEN BY THESE PRESENTS: WHEREAS, AT&T CORP., a New York corporation (hereinafter referred to as the "Company"), proposes to file with the Securities and Exchange Commission, under the provisions of the Securities Exchange Act of 1934, as amended, an annual report on Form 10-K; and WHEREAS, the undersigned is a director of the Company: NOW, THEREFORE, the undersigned hereby constitutes and appoints R. W. MILLER, M. B. TART and S. L. PRENDERGAST, and each of them, as attorneys for him or her and in his or her name, place and stead, and in his or her capacity as a director of the Company, to execute and file such annual report, and thereafter to execute and file any amendments or amendments thereto, hereby giving and granting to said attorneys, and each of them, full power and authority to do and perform each and every act and thing whatsoever requisite and necessary to be done in and about the premises, as fully, to all intents and purposes, as he or she might or could do if personally present at the doing thereof, hereby ratifying and confirming all that said attorneys may or shall lawfully do, or cause to be done, by virtue hereof. IN WITNESS WHEREOF, the undersigned has executed this Power of Attorney this 27th day of February, 1996. Kenneth T. Derr Director