Took control of family fortune after his father, Kenneth Thomson, died last June. Had already succeeded his father as chairman of Thomson Corp., media conglomerate in which the family has a 70% stake, in 2002. Grandfather Roy founded the business in 1934. Company traded away traditional printed titles in order to move into software and electronic media for professionals, like Westlaw, a legal research tool. With his brother Peter also serves as cochair of family's investment concern, Woodbridge. Well known art collectors, the family bought $5 million worth of native North American art at auction last year, including a $1.8 million face mask, the highest amount ever spent on a single piece of native North American art. David said the family bought the collection in honor of his late father.
