D avid Thomson, 3rd Baron Thomson of Fleet, is a Canadian media magnate and the chairman of Thomson Reuters, the global media and financial information giant. He is the son of the late Kenneth Thomson and the grandson of Roy Thomson, who founded the family's media empire. As the head of the third generation, David oversees one of the world's most significant media and data fortunes.

The family's wealth was transformed in 2008 with the merger of their company, The Thomson Corporation, with the British news agency Reuters. As chairman of the combined entity, David Thomson has stewarded the company's focus on providing high-value information, data, and software for legal, tax, and financial professionals. The family's private holding company, Woodbridge, controls a majority stake in the publicly traded Thomson Reuters. David is known for being intensely private and is also a passionate art collector.