Who was the person called walking encyclopedia?

The term "walking encyclopedia" is often used to describe someone who has a vast amount of knowledge on a wide range of topics. There's no single person who definitively holds this title. It's more of a descriptive phrase.

However, some people who have been called "walking encyclopedias" include:

* Dr. John H. Johnson: An American educator and author, known for his vast knowledge of African American history.

* Isaac Asimov: A science fiction writer and professor who wrote prolifically on science and history.

* Stephen Fry: A British actor, comedian, and writer known for his wide-ranging knowledge and witty use of it.

* Ken Jennings: An American game show contestant known for his record-breaking streak on "Jeopardy!".

Ultimately, anyone who possesses exceptional knowledge across multiple subjects could be called a "walking encyclopedia."