Amos Urban Shirk

Amos Urban Shirk ( 1890 – October 20, 1956) was an American businessman, author and reader of encyclopedias.

As a businessman he worked in the food industry. He wrote Marketing Through Food Brokers, published in 1939 by McGraw-Hill. He invented a synthetic chicle and introduced vitamin capsules to grocery stores.

He was also renowned as a prodigious reader. Shirk read the entire 23-volume 1911 Encyclopædia Britannica from cover to cover in four and a half years, reading on average three hours per evening, and taking two to six months per volume. Starting in 1934, he began reading the 14th edition, saying he found it a "big improvement" over the 11th, and saying that "most of the material had been completely rewritten".