STL Places.com: Peanut Butter* - In 1890, an unknown St. Louis physician encouraged a food products company owner, George A. Bayle Jr., to process and package ground peanut paste as a nutritious protein substitute for people with poor teeth who couldn't chew meat.
But didn't Dr. George Washington Carver (~1864-1943) invent peanut butter ? No. He invented a lot of uses for a lot of agricultural products and without his pushing of peanuts and others as crops to rebuild the depleted soils of the south there would not have been a supply of peanuts to make peanut butter.
Click the links below for more information on peanut butter:
Wikipedia: Peanut Butter
Peanut Butter Facts