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 S. L. PRENDERGAST, M. B. TART and M. J. WASSER 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 17th day of March 1997. /s/ R. E. Allen -------------------- By: R. E. Allen Chairman of the Board and Director 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 S. L. PRENDERGAST, M. B. TART and M. J. WASSER 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 17th day of March, 1997. /s/ J. R. Walter ---------------------- By: J. R. Walter President, Chief Operating Officer and Director 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 S. L. PRENDERGAST, M. B. TART and M. J. WASSER 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 17th day of March, 1997. /s/ R. W. Miller ---------------------- By: R. W. Miller Senior Executive Vice President and Chief Financial Officer 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 S. L. PRENDERGAST and M. J. WASSER, 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 17th day of March, 1997. /s/ M. B. Tart -------------------- By: M. B. Tart Vice President and Controller 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 S. L. PRENDERGAST, M. B. TART and M. J. WASSER 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 18th day of March, 1997. /s/ Kenneth T. Derr --------------------- By: Kenneth T. Derr Director 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 S. L. PRENDERGAST, M. B. TART and M. J. WASSER 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 17th day of March, 1997. /s/ M. Kathryn Eickhoff ------------------------ By: M. Kathryn Eickhoff Director 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 S. L. PRENDERGAST, M. B. TART and M. J. WASSER 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 March, 1997. /s/ Walter Y. Elisha ---------------------- By: Walter Y. Elisha Director 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 S. L. PRENDERGAST, M. B. TART and M. J. WASSER 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 17th day of March, 1997. /s/ Ralph S. Larsen ---------------------- By: Ralph S. Larsen Director 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 S. L. PRENDERGAST, M. B. TART and M. J. WASSER 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 17th day of March, 1997. /s/ Donald F. McHenry ----------------------- By: Donald F. McHenry Director 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 S. L. PRENDERGAST, M. B. TART and M. J. WASSER 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 17th day of March, 1997. /s/ Michael I. Sovern ------------------------ By: Michael I. Sovern Director 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 S. L. PRENDERGAST, M. B. TART and M. J. WASSER 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 March, 1997. /s/ Joseph D. Williams ----------------------- By: Joseph D. Williams Director 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 S. L. PRENDERGAST, M. B. TART and M. J. WASSER 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 March, 1997. /s/ Thomas H. Wyman ---------------------- By: Thomas H. Wyman Director