Press Release Details

Mary Cirillo Joins the Board of The Thomson Corporation

May 4, 2005 at 1:49 PM EDT

TORONTO, May 4 /PRNewswire-FirstCall/ -- The Board of Directors of The Thomson Corporation (NYSE: TOC; TSX: TOC) announced today that Mary Cirillo was elected to the Board at the company's annual and special meeting of shareholders in Toronto.

(Logo: http://www.newscom.com/cgi-bin/prnh/20020227/NYW014LOGO )

Ms. Cirillo, age 57, is the former Chair and Chief Executive Officer of Opcenter, LLC, an internet consulting firm. Before joining Opcenter, Ms. Cirillo served as Chief Executive Officer of Global Institutional Services at Bankers Trust. She was also a member of the Bankers Trust Management Committee and became a member of Deutsche Bank's senior management team following Deutsche Bank's acquisition of Bankers Trust. Before joining Bankers Trust, Ms. Cirillo spent 20 years at Citibank where she was most recently responsible for the Global Relationship Banking Operations and Technology Group.

Ms. Cirillo is a director of Healthcare Property Investors. In 1994, Ms. Cirillo was awarded The Star award from the New York Women's Agenda, which honors the top business and professional women in New York. She was also recognized by NextStep for her efforts in the area of workforce diversity.

The Thomson Corporation

The Thomson Corporation (http://www.thomson.com), with 2004 revenues of $8.10 billion, is a global leader in providing integrated information solutions to business and professional customers. Thomson provides value- added information, software tools and applications to more than 20 million users in the fields of law, tax, accounting, financial services, higher education, reference information, corporate e-learning and assessment, scientific research and healthcare. With operational headquarters in Stamford, Conn., Thomson has approximately 40,000 employees and provides services in approximately 130 countries. The Corporation's common shares are listed on the New York and Toronto stock exchanges (NYSE: TOC; TSX: TOC).

     Media Contact:                         Investor Contact:
     Jason Stewart                          Frank J. Golden
     Vice President, Media Relations        Vice President, Investor Relations
     (203) 539-8339                         (203) 539-8470
     jason.stewart@thomson.com              frank.golden@thomson.com
SOURCE  The Thomson Corporation
    -0-                             05/04/2005
    /CONTACT:  Media Contact - Jason Stewart, Vice President, Media Relations,
+1-203-539-8339, jason.stewart@thomson.com, or Investor Contact - Frank J.
Golden, Vice President, Investor Relations, +1-203-539-8470,
frank.golden@thomson.com/
    /Photo:  http://www.newscom.com/cgi-bin/prnh/20020227/NYW014LOGO /
    /Web site:  http://www.thomson.com /
    (TOC TOC.)

CO:  The Thomson Corporation
ST:  Ontario, New York
IN:  FIN
SU:  PER

EA
-- NYW049 --
4076 05/04/2005 13:47 EDT http://www.prnewswire.com