O'Ceallaigh Medal 2013 The O'Ceallaigh Medal was established by the estate of the late Prof. Cormac O'Ceallaigh and the Dublin Institute for Advanced Studies to honour "outstanding contributions to cosmic ray physics" and is awarded by the IUPAP Commission on Cosmic Rays. The Commission wishes to use this award to recognize significant contributions to our field over an extended career. The selection will be made by a subcommittee of the IUPAP C4 Commission. The medal will be presented at the 33nd ICRC at Rio de Janeiro, Brazil, in July 2013. For further information, please visit the link Suggestions for suitable recipients of the medal, together with supporting information, should be sent to Johannes Knapp, Chair of the Cosmic Ray Commission (C4). The sponsor may also wish to ask two co-sponsors to send supporting letters. Nominations should be sent to the following address: Dr. Johannes Knapp School of Physics and Astronomy University of Leeds, Leeds LS2 9JT, UK E-mail: firstname.lastname@example.org Nomination deadline: 28 February 2013 Self nominations will not be considered.