maven, barking moonbat

University of Chicago Press design maven tours 57th Street Books; judgments ensue.

By design, you can tell a book by its cover

Shopping for books with the cover designer for University of Chicago Press.

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Sam Zell's Deal from Hell

The turnaround maven should have seen the problems ahead in the newspaper industry. His blind side may cost Tribune Co. its very life

Wikipedia article "Moonbat".
Moonbat (also "barking moonbat" and "moonbat crazy") is a term often used currently in U.S. politics as a political epithet referring to anyone that is liberal or on the left. "Wingnut" (or "right wing nut") is frequently preferred as the analogous epithet aimed at the political right.... According to an article by New York Times language maven William Safire, the term was first used by the famous science fiction author Robert A. Heinlein in 1947. (© Wikipedia)

maven 
noun [C] US INFORMAL
a person with good knowledge or understanding of a subject