Which dictionary brand created the famous 'Defining Language Excellence' advertising campaign that featured celebrities looking up obscure words related to their professions?

In the world of language and linguistics, dictionaries have employed various marketing strategies to stand out in a competitive market. From memorable mascots to innovative advertising campaigns, dictionary publishers have worked to position their reference works as authoritative and essential. Test your knowledge about one of the most successful dictionary advertising campaigns in publishing history!

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Oxford University Press with their 'Word Masters' series featuring Stephen Hawking and Margaret Atwood
Merriam-Webster with their 'Word of the Day' campaign featuring Neil deGrasse Tyson and Yo-Yo Ma
Cambridge Dictionary with their 'Language Leaders' spots featuring David Attenborough and J.K. Rowling
Collins Dictionary with their 'Precision in Words' advertisements featuring Gordon Ramsay and Emma Thompson