Sleeper attended grammar, or perhaps high school, at The Old Academy, located on West 2nd Street between Fulton and Franklin Streets in Chester.
In the 1890s, he had at least partial control of a baseball team in Marcus Hook, some three miles southwest of Chester.
He eventually passed control of the team to local baseball impresario Jesse Frysinger, and it moved in 1900 to Wilmington, Delaware.
But she had, in fact, already died and so the property was sold for $43,000 ($671,857 today[4]) to James H. Gorbey, who would go on to be mayor of Chester (1964 to 1967) and U.S. District Court judge from 1970 until his death in 1977.
[3] Sleeper was a member of the Rotary Club and donated funds to support the Josiah Sleeper Award for recognition of patriotic service of foreign born Americans.