The 1953 Worldcon held September 5-7 at the Bellevue-Strafford Hotel in Philadelphia, PA. GoH: Willy Ley. Chaired by Milton Rothman. Isaac Asimov was Toastmaster. Officially known as "The 11th Worldcon," it was popularly known as Philcon II. Milton A. Rothman replaced James A. Williams, the original chairman, upon Williams' death. Tom Clareson, PhD was Vice-Chairman.
There was some ill-feeling at Chicon II when the spur-of-the-moment Philadelphia bid (see The Story Behind Philly in '53) beat a San Francisco bid for the con. This led to the adoption of the rotation plan.