Roger Bannister did again on Aug 7, 1954.
If your looking for the next person, Laszlo Tibori did it the following year (who beat out Chris Chataway and Brian Hewson, who also broke 4 minutes).
I think, I hope, I'm not really sure ... LOL
Here is the list of the 1st Sub-4 Minute Miles:
Roger Bannister 3:59.4 on May 6, 1954
John Landy 3:58.0 on June 21, 1954
Roger Bannister 3:58.8 on August 7, 1954
John Landy 3:59.6 on August 7, 1954 (2nd place)
Laszlo Tibori 3:59.0 on May 28, 1955
Chris Chataway 3:59.8 on May 28, 1955 (2nd Place)
Brian Hewson 3:59.8 on May 28, 1955 (3rd Place)
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"I've never felt closer to a group of people. Not even in the portable johns at Woodstock"
Reverend Jim Ignatowski
[This message has been edited by CrazyCanuck (edited 02-09-2000).]