found: McAllister Small Manuscript Collections, 1781-1868(John Sefton, actor and manager, Walnut Street Theatre, Philadelphia)
found: Appleton's Cyclopaedia of American biography, 1888(John Sefton, actor, born in Liverpool, England, 15 January 1805; died in New York City, 19 September 1868; came to United States in 1827; stage manager at Astor Place Opera House in New York, and later at the Walnut Street Theatre, Philadelphia)
found: New York times, 09-20-1868, viewed Mar. 29, 2005(John Sefton, comedian, died suddenly yesterday; first appeared on stage in Philadelphia; resident of the United States since 1827)
