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In page Otto Jespersen:

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In 1887–1888, he traveled to England, Germany and France, meeting linguists like Henry Sweet and Paul Passy and attending lectures at institutions such as Oxford University.[citation needed] Following a tip from his mentor Vilhelm Thomsen that not many years would pass before there would be a vacancy for a specialist in English, he returned to Copenhagen in August 1888 and began work on his doctoral dissertation on the English case system, which he defended in 1891. His doctorate entitled Jespersen to teach in the university without pay as a Privatdocent; he took this opportunity to teach classes on Chaucer and Old English, thereby adding to his qualifications for the post; he also wrote a book on Chaucer.[9]