Exhibit 24 POWER OF ATTORNEY The undersigned, a Director of Sotheby's Holdings, Inc., a Michigan corporation (the "Company"), does hereby constitute and appoint William S. Sheridan, with full power of substitution, as his or her true and lawful attorney and agent to execute in his or her name and on his or her behalf, as a Director of the Company, the Company's Registration Statement on Form S-8 with respect to the Company's 2003 Restricted Stock Plan, and any and all amendments thereto to be filed with the Securities and Exchange Commission pursuant to the Securities Exchange Act of 1934, as amended. Each such attorney or agent shall have, and may exercise, all of the powers hereby conferred. IN WITNESS WHEREOF, the undersigned has hereunto subscribed his or her signature this 19th day of November, 2003. /s/ Conrad Black -------------------------- LORD BLACK OF CROSSHARBOUR POWER OF ATTORNEY The undersigned, a Director of Sotheby's Holdings, Inc., a Michigan corporation (the "Company"), does hereby constitute and appoint William S. Sheridan, with full power of substitution, as his or her true and lawful attorney and agent to execute in his or her name and on his or her behalf, as a Director of the Company, the Company's Registration Statement on Form S-8 with respect to the Company's 2003 Restricted Stock Plan, and any and all amendments thereto to be filed with the Securities and Exchange Commission pursuant to the Securities Exchange Act of 1934, as amended. Each such attorney or agent shall have, and may exercise, all of the powers hereby conferred. IN WITNESS WHEREOF, the undersigned has hereunto subscribed his or her signature this 20th day of November, 2003. /s/ Michael Blakenham ------------------------ MICHAEL BLAKENHAM POWER OF ATTORNEY The undersigned, a Director of Sotheby's Holdings, Inc., a Michigan corporation (the "Company"), does hereby constitute and appoint William S. Sheridan, with full power of substitution, as his or her true and lawful attorney and agent to execute in his or her name and on his or her behalf, as a Director of the Company, the Company's Registration Statement on Form S-8 with respect to the Company's 2003 Restricted Stock Plan, and any and all amendments thereto to be filed with the Securities and Exchange Commission pursuant to the Securities Exchange Act of 1934, as amended. Each such attorney or agent shall have, and may exercise, all of the powers hereby conferred. IN WITNESS WHEREOF, the undersigned has hereunto subscribed his or her signature this 22nd day of November, 2003. /s/ Steven B.Dodge ------------------ STEVEN B. DODGE POWER OF ATTORNEY The undersigned, a Director of Sotheby's Holdings, Inc., a Michigan corporation (the "Company"), does hereby constitute and appoint William S. Sheridan, with full power of substitution, as his or her true and lawful attorney and agent to execute in his or her name and on his or her behalf, as a Director of the Company, the Company's Registration Statement on Form S-8 with respect to the Company's 2003 Restricted Stock Plan, and any and all amendments thereto to be filed with the Securities and Exchange Commission pursuant to the Securities Exchange Act of 1934, as amended. Each such attorney or agent shall have, and may exercise, all of the powers hereby conferred. IN WITNESS WHEREOF, the undersigned has hereunto subscribed his or her signature this 19th day of November, 2003. /s/ Max M. Fisher ----------------- MAX M. FISHER POWER OF ATTORNEY The undersigned, a Director of Sotheby's Holdings, Inc., a Michigan corporation (the "Company"), does hereby constitute and appoint William S. Sheridan, with full power of substitution, as his or her true and lawful attorney and agent to execute in his or her name and on his or her behalf, as a Director of the Company, the Company's Registration Statement on Form S-8 with respect to the Company's 2003 Restricted Stock Plan, and any and all amendments thereto to be filed with the Securities and Exchange Commission pursuant to the Securities Exchange Act of 1934, as amended. Each such attorney or agent shall have, and may exercise, all of the powers hereby conferred. IN WITNESS WHEREOF, the undersigned has hereunto subscribed his or her signature this 20th day of November, 2003. /s/ Hartington ---------------- LORD HARTINGTON POWER OF ATTORNEY The undersigned, a Director of Sotheby's Holdings, Inc., a Michigan corporation (the "Company"), does hereby constitute and appoint William S. Sheridan, with full power of substitution, as his or her true and lawful attorney and agent to execute in his or her name and on his or her behalf, as a Director of the Company, the Company's Registration Statement on Form S-8 with respect to the Company's 2003 Restricted Stock Plan, and any and all amendments thereto to be filed with the Securities and Exchange Commission pursuant to the Securities Exchange Act of 1934, as amended. Each such attorney or agent shall have, and may exercise, all of the powers hereby conferred. IN WITNESS WHEREOF, the undersigned has hereunto subscribed his or her signature this 5th day of December, 2003. /s/ Jeffrey H. Miro ------------------- JEFFREY H. MIRO POWER OF ATTORNEY The undersigned, a Director of Sotheby's Holdings, Inc., a Michigan corporation (the "Company"), does hereby constitute and appoint William S. Sheridan, with full power of substitution, as his or her true and lawful attorney and agent to execute in his or her name and on his or her behalf, as a Director of the Company, the Company's Registration Statement on Form S-8 with respect to the Company's 2003 Restricted Stock Plan, and any and all amendments thereto to be filed with the Securities and Exchange Commission pursuant to the Securities Exchange Act of 1934, as amended. Each such attorney or agent shall have, and may exercise, all of the powers hereby conferred. IN WITNESS WHEREOF, the undersigned has hereunto subscribed his or her signature this 20th day of November, 2003. /s/ Sharon Rockefeller ---------------------- SHARON ROCKEFELLER POWER OF ATTORNEY The undersigned, a Director of Sotheby's Holdings, Inc., a Michigan corporation (the "Company"), does hereby constitute and appoint William S. Sheridan, with full power of substitution, as his or her true and lawful attorney and agent to execute in his or her name and on his or her behalf, as a Director of the Company, the Company's Registration Statement on Form S-8 with respect to the Company's 2003 Restricted Stock Plan, and any and all amendments thereto to be filed with the Securities and Exchange Commission pursuant to the Securities Exchange Act of 1934, as amended. Each such attorney or agent shall have, and may exercise, all of the powers hereby conferred. IN WITNESS WHEREOF, the undersigned has hereunto subscribed his or her signature this 18th day of November, 2003. /s/ Michael I. Sovern --------------------- MICHAEL I. SOVERN POWER OF ATTORNEY The undersigned, a Director of Sotheby's Holdings, Inc., a Michigan corporation (the "Company"), does hereby constitute and appoint William S. Sheridan, with full power of substitution, as his or her true and lawful attorney and agent to execute in his or her name and on his or her behalf, as a Director of the Company, the Company's Registration Statement on Form S-8 with respect to the Company's 2003 Restricted Stock Plan, and any and all amendments thereto to be filed with the Securities and Exchange Commission pursuant to the Securities Exchange Act of 1934, as amended. Each such attorney or agent shall have, and may exercise, all of the powers hereby conferred. IN WITNESS WHEREOF, the undersigned has hereunto subscribed his or her signature this 19th day of November, 2003. /s/ Donald M. Stewart --------------------- DONALD M. STEWART POWER OF ATTORNEY The undersigned, a Director of Sotheby's Holdings, Inc., a Michigan corporation (the "Company"), does hereby constitute and appoint William S. Sheridan, with full power of substitution, as his or her true and lawful attorney and agent to execute in his or her name and on his or her behalf, as a Director of the Company, the Company's Registration Statement on Form S-8 with respect to the Company's 2003 Restricted Stock Plan, and any and all amendments thereto to be filed with the Securities and Exchange Commission pursuant to the Securities Exchange Act of 1934, as amended. Each such attorney or agent shall have, and may exercise, all of the powers hereby conferred. IN WITNESS WHEREOF, the undersigned has hereunto subscribed his or her signature this 16th day of December, 2003. /s/ Robert S. Taubman --------------------- ROBERT S. TAUBMAN POWER OF ATTORNEY The undersigned, a Director of Sotheby's Holdings, Inc., a Michigan corporation (the "Company"), does hereby constitute and appoint William S. Sheridan, with full power of substitution, as his or her true and lawful attorney and agent to execute in his or her name and on his or her behalf, as a Director of the Company, the Company's Registration Statement on Form S-8 with respect to the Company's 2003 Restricted Stock Plan, and any and all amendments thereto to be filed with the Securities and Exchange Commission pursuant to the Securities Exchange Act of 1934, as amended. Each such attorney or agent shall have, and may exercise, all of the powers hereby conferred. IN WITNESS WHEREOF, the undersigned has hereunto subscribed his or her signature this 18th day of November, 2003. /s/ Robin Woodhead ------------------ ROBIN G. WOODHEAD