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Dialog Appoints Craig Lathrop as Chief Technology Officer

CARY, N.C., USA (April 23, 2004) — Dialog, a Thomson (NYSE: TOC; TSX: TOC) business and a leading worldwide provider of online-based information services and integrated information solutions, announced today that Craig Lathrop has been appointed chief technology officer.

Lathrop joined Dialog in 2000 as vice president, new technologies. In that position, he spearheaded the recently announced integration of Dialog business information, news and market research services onto a new technology platform.

In his new post, Lathrop manages the company’s technology infrastructure, with staff and resources in the United Kingdom, United States and Switzerland.

“Dialog is embarked on an ambitious program of innovation, with new and enhanced products to be rolled out throughout this year and beyond,” said Roy M. Martin, Jr., Dialog president and chief executive officer. “Craig’s leadership in the technology arena will be vital to our success. We are delighted to announce his well-deserved promotion today.”

Prior to joining Dialog, Lathrop worked for Thomson Newspapers, rising from project manager to vice president, interactive development. He also worked for Infinium Software and Integrated Newspaper Systems International in a variety of technical and management positions.

Lathrop is a graduate of the University of Northern Iowa with a bachelor’s degree in business management. He and his family now live in Cary, N.C.

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About Dialog and The Thomson Corporation
Dialog, a pioneer in developing the technology behind electronic information retrieval, is the world leader in providing online-based information services to organizations seeking competitive advantages in such fields as business, science, engineering, finance and law.

Today, the online services provided by Dialog — offered through the Dialog®, Dialog Profound®, Dialog DataStar™, NewsEdge and Intelligence Data brands — give users the ability to precisely retrieve data from more than 1.4 billion unique records, accessible via the Internet or through delivery to enterprise intranets. Searchable content includes articles and reports from thousands of real-time news feeds, newspapers, broadcast transcripts and trade publications, plus research reports and analyst notes providing support for financial decision-making, as well as in-depth repositories of scientific and technical data, patents, trademarks and other intellectual property data. Information professionals and end-users at business, professional and government organizations in more than 100 countries prize Dialog services for their depth and breadth of content, precision searching and speed.

Based in Cary, N.C., USA, Dialog has operations in 31 other countries. Dialog (www.dialog.com) is a business of The Thomson Corporation (NYSE: TOC; TSX: TOC). With 2003 revenues of US$7.6 billion, Thomson (www.thomson.com) is a global leader in providing integrated information solutions to business and professional customers.

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All designated trademarks used herein are the property of The Dialog Corporation or its subsidiaries. Registered marks are registered by The Dialog Corporation or its subsidiaries with the U.S. Patent and Trademark Office. All other marks are trademarks or registered trademarks of their respective owners.

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