LONDON — Joseph Mifsud, who investigators say tempted a Trump campaign official with a promise of Russian “dirt” on Hillary Clinton, always presented himself as a professor, according to several online biographies and a person who knows him. But his academic affiliations are hard to pin down.

He identified himself as the director of the London Academy of Diplomacy — or, on another web page, as its honorary director. But the academy is difficult to find.

The academy was affiliated with the University of East Anglia until 2014, before transferring its affiliation to the University of Stirling, in Scotland, the University of East Anglia said in a statement on Tuesday.

In a biography that was previously displayed on the website of the London Center of International Law Practice, where Mr. Mifsud was the director of international strategic development, there is no mention of academic training or any degrees he may have earned. Instead, he is listed as the “honorary director” of the London Academy of Diplomacy, an “honorary” professor at the University of East Anglia and a full professor at Stirling University.