Rufus Crosby Kemper Sr.

Rufus Crosby Kemper Sr. (1892–1972) was an American banker. He is known for expanding City Center Bank, acquired by his father, from a three-man operation with $600,000 in deposits into UMB Financial Corporation, with $300 million in deposits, during his tenure from 1919 to September 1967.

Kemper is a great-grand-uncle of actress Ellie Kemper (born 1980).