Professor David Crystal is widely regarded as a leading expert on the English language who published numerous language books. He held and holds numerous public lectures on the English Language.
Here is a list of David Crystal books, a recent interview with him and his website.
One of my favourite books is The Story of English in 100 Words.
David Cyrstal is both a professor on the English language and a writer of popular English language books.
Does German have any current well-known authors on the German language in terms of the scope and breadth as regards the German language?
What German authors are there that have published well-regarded popular German language books ?