So What IS A Herring Maven?

Here is what Wikipedia says:

A maven (also mavin) is a trusted expert in a particular field, who seeks to pass knowledge on to others. The word maven comes from Hebrew, and means one who understands, based on an accumulation of knowledge.^[1]

The word reached English through Late Hebrew mēbhīn, which in turn derived it from the Hebrew mevin (מבֿין), meaning "one who understands," and relates to the word binah, which denotes understanding or wisdom in general. It was first recorded (spelled mayvin) in English in 1950 (in the Jewish Standard of Toronto), and popularized in the United States in the 1960s by a series of commercials created by Martin Solow for Vita Herring, featuring "The Beloved Herring Maven." The “Beloved Herring Maven“ ran in radio ads from 1964-1968, and was then brought back in 1983 with Allan Swift, the original voice of the Maven.^[2]
Many sites credit Vita with popularizing the word maven. An example of a print advertisement including the Maven is: "Get Vita at your favorite supermarket, grocery or delicatessen. Tell them the beloved Maven sent you. It won’t save you any money: but you’ll get the best herring".^[3]
Since the 1980s it has become more common since William Safire adapted it to describe himself as "the language maven". The word is mainly confined to American English, but did not appear with the publication of the 1976 edition of Webster's Third New International Dictionary; it is, however, included in the Oxford English Dictionary second edition (1989). Numerous individuals and entities now affix maven or mavin to indicate their expertise in a particular area.