The distinguished scientist, Mr. Stephen, of AKL University, will be addressing the crowd tomorrow.
In the second sentence, the comma before and after the name indicates we are talking about a specific scientist of AKL University. The comma after the name also tells us that the information after the name is essential to identify the person.
https://www.grammar.com/the_correct_way_to_use_commas_with_names_and_titles
2: The distinguished AKL University scientist, Mr. Stephen, will be addressing the crowd tomorrow.
How does 2 differ in usage to the first example in terms of comma ?
In 2 we are talking about a specific distinguished scientist at AKL University, but just distinguised scientist alone is not enough information to require commas (the information does not specifically identify the subject).
I would have wrote it like this just ommitting the first comma.
The distinguished scientist Mr. Stephen, of AKL University, will be addressing the crowd tomorrow.
panda blue 483 (1) The distinguished scientist, Mr. Stephen, of AKL University, will be addressing the crowd tomorrow. (2) The distinguished AKL University scientist, Mr.
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panda blue 483(1) The distinguished scientist, Mr. Stephen, of AKL University, will be addressing the crowd tomorrow.
(2) The distinguished AKL University scientist, Mr. Stephen, will be addressing the crowd tomorrow.
In (1), the information that he belongs to AKL University is presented parenthetically, which makes it seem more peripheral than in (2).