June 2012 is the centenary of Alan Turing. We have two articles to celebrate that event. We also have an unusual article about Turing's contributions to the biological sciences. As a counterpoint, there are poignant articles about Farey series and about the Yang-Mills equations. In an effort to inform the readership of timely matters, we have two articles arguing the two sides of the Elsevier boycott. Finally, we remember the remarkable applied mathematician Jerrold Marsden. --Steven G. Krantz, Editor
Patrice Philippon
(pp. 746)
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Tudor Ratiu and Alan Weinstein, Coordinating Editors
(pp. 758)
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S. Barry Cooper
(pp. 776)
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J. D. Murray
(pp. 785)
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Samuel L. Marateck
(pp. 802)
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