Leonard Medal Research Articles

Oral histories in meteoritics and planetary science: II. Robert N. Clayton

Abstract— In this interview, taped during the Meteoritical Society meeting in Chicago in 2000 August, Robert Clayton who started his career as a terrestrial geochemist, describes how he first analyzed meteorite samples with great reluctance after years of resisting every suggestion from his colleagues that he study them. He also relates how the unaccountable results he obtained while correcting oxygen‐18 analyses for carbon‐13 in CO2 made sense only when he finally realized that he actually was analyzing oxygen‐17. By sheer serendipity this result led to the fundamentally important new result that Allende and other meteorites carry an anomalous exotic component. Clayton now finds research on extra‐terrestrial materials to be extremely interesting and exciting, with new systems turning up every year. He regrets the lack of interest he encounters in many young scientists and hopes that the availability of martian samples will persuade more terrestrial geologists and geochemists to enter the field. Clayton made his career at the University of Chicago where he has served since 1980 as the Enrico Fermi Distinguished Service Professor. In 1982 The Meteoritical Society honored Robert Clayton with its Leonard Medal.

Oral histories in meteoritics and planetary science: III. Robert M. Walker

Abstract— In this interview, taped in 2000 August, during the meeting of the Meteoritical Society in Chicago, Robert Walker recalls that he began studying meteorites when he realized that they should display particle tracks caused by their bombardment by cosmic rays. Walker was much intrigued by the idea of finding fossil tracks from old cosmic rays. Among his more important accomplishments, he lists the discovery of tracks of extremely heavy cosmic rays in meteorites and those of very lowenergy solar flare particles in lunar samples. He has played a leadership role in research on interplanetary dust particles and on presolar grains in meteorites in an effort to learn more about the origins of the elements. Walker has spent most of his career at Washington University in St. Louis where he established the McDonnell Center for Space Science. In 1993, the Meteoritical Society presented him with the Leonard Medal.

1999 Leonard Medal Citation for Grenville Turner. 1999 July 12, Johannesburg, South Africa

Meteoritics & Planetary ScienceVolume 35, Issue S5 p. A7-A8 Free Access 1999 Leonard Medal Citation for Grenville Turner. 1999 July 12, Johannesburg, South Africa Robert m. Walker, Robert m. Walker Washington University McDonnell Center for Space Sciences Physics Department St. Louis, Missouri 63130-4899, USASearch for more papers by this author Robert m. Walker, Robert m. Walker Washington University McDonnell Center for Space Sciences Physics Department St. Louis, Missouri 63130-4899, USASearch for more papers by this author First published: 04 February 2010 https://doi.org/10.1111/j.1945-5100.2000.tb01799.xAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume35, IssueS5September 2000Pages A7-A8 RelatedInformation

Leonard Medal Acceptance Address. 1999 July 12, Johannesburg, South Africa

Leonard Medal Acceptance Address. 1999 July 12, Johannesburg, South Africa

1998 Leonard Medal Citation for Stuart Ross Taylor: 1998 July 27, Dublin, Ireland

1998 Leonard Medal Citation for Stuart Ross Taylor: 1998 July 27, Dublin, Ireland

Leonard Medal Citation for Ernst Zinner

Meteoritics & Planetary ScienceVolume 33, Issue 4 p. 547-547 Free Access Leonard Medal Citation for Ernst Zinner Edward Anders, Edward Anders Hintere Engehaldenstr. 12 CH-3004 Bern, SwitzerlandSearch for more papers by this author Edward Anders, Edward Anders Hintere Engehaldenstr. 12 CH-3004 Bern, SwitzerlandSearch for more papers by this author First published: 04 February 2010 https://doi.org/10.1111/j.1945-5100.1998.tb01663.xCitations: 1AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article.Citing Literature Volume33, Issue4July 1998Pages 547-547 RelatedInformation

Leonard Medal Citation for D. Brownlee 1996 July 25, Berlin, Germany

Meteoritics & Planetary ScienceVolume 32, Issue 2 p. 155-156 Free Access Leonard Medal Citation for D. Brownlee 1996 July 25, Berlin, Germany Robert M. Walker, Robert M. Walker McDonnell Center for Space Sciences Washington University, Box 1105 One Brookings Drive St. Louis, MO 63130-4899Search for more papers by this author Robert M. Walker, Robert M. Walker McDonnell Center for Space Sciences Washington University, Box 1105 One Brookings Drive St. Louis, MO 63130-4899Search for more papers by this author First published: 04 February 2010 https://doi.org/10.1111/j.1945-5100.1997.tb01256.xAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume32, Issue2March 1997Pages 155-156 RelatedInformation

Leonard Medal Citation for A. G. W. Cameron

MeteoriticsVolume 30, Issue 2 p. 131-132 Leonard Medal Citation for A. G. W. Cameron G. J. Wasserburg, G. J. Wasserburg Division of Geological and Planetary Sciences Mail Code 170-25 California Institute of Technology Pasadena, California 91125, USA (Division Contribution 5460(873))Search for more papers by this authorLunatic Asylum, Lunatic Asylum Division of Geological and Planetary Sciences Mail Code 170-25 California Institute of Technology Pasadena, California 91125, USA (Division Contribution 5460(873))Search for more papers by this author G. J. Wasserburg, G. J. Wasserburg Division of Geological and Planetary Sciences Mail Code 170-25 California Institute of Technology Pasadena, California 91125, USA (Division Contribution 5460(873))Search for more papers by this authorLunatic Asylum, Lunatic Asylum Division of Geological and Planetary Sciences Mail Code 170-25 California Institute of Technology Pasadena, California 91125, USA (Division Contribution 5460(873))Search for more papers by this author First published: March 1995 https://doi.org/10.1111/j.1945-5100.1995.tb01109.xAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL No abstract is available for this article. Volume30, Issue2March 1995Pages 131-132 RelatedInformation

Leonard Medal Citation for Robert M. Walker

The 1993 Leonard Medalist, Robert M. Walker, started his professional career during the 1950s, as a physicist studying radiation effects in solids. The work for which he is probably best known, the study of particle tracks in solids, began in the early 1960s at the General Electric Research Laboratories, in collaboration with R. L. Fleischer and P. B. Price. Many of us working in the field of meteoritics have had no formal training in geology. This is usually a handicap, but it proved to be important in launching the science of trackology. Muscovite mica was an important material in the early studies of particle tracks and, even today, is the optimum track detector in many respects.

The Leonard Medal Address

Abstract— The science of nucleosynthesis was substantially inspired by chemical analyses of meteorites. As if in repayment, that theory now imbues meteoritics with enlarged meaning. I recount the emergence of four great issues for nucleosynthesis—issues that received decades of my own attention; and I describe unexpected abundance patterns within meteorites that were suggested by the resolution of those issues. The latter have altered the information content of meteoritic science. The issues are: 1. a quantitative s-process theory 2. cosmoradiogenic chronology 3. explosive nucleosynthesis and gamma-ray astronomy 4. cosmic chemical memory Starting from historical origins for each issue, I comment upon both the broad cultural canvas in which they lie and my own work in their establishment. Examples of predicted (or rationalized) meteoritic measurements illustrate our surprised delight at the expansion of the range and power of meteoritic science.

Leonard Medal Citation for Donald D. Clayton

MeteoriticsVolume 27, Issue 1 p. 4-4 Leonard Medal Citation for Donald D. Clayton Guenter W. Lugmair, Guenter W. Lugmair University of California, San Diego Scripps Institute of Oceanography La Jolla, California 92093-0212Search for more papers by this author Guenter W. Lugmair, Guenter W. Lugmair University of California, San Diego Scripps Institute of Oceanography La Jolla, California 92093-0212Search for more papers by this author First published: March 1992 https://doi.org/10.1111/j.1945-5100.1992.tb01052.xAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume27, Issue1March 1992Pages 4-4 RelatedInformation

The meteoritical society nominations for the leonard medal

The meteoritical society nominations for the leonard medal

Presentation of the 1987 LEONARD MEDAL to DR. MASATAKE HONDA

MeteoriticsVolume 22, Issue 4 p. 309-309 Presentation of the 1987 LEONARD MEDAL to DR. MASATAKE HONDA First published: December 1987 https://doi.org/10.1111/j.1945-5100.1987.tb01276.xCitations: 1AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article.Citing Literature Volume22, Issue4December 1987Pages 309-309 RelatedInformation

The meteoritical society nominations for the leonard medal

The meteoritical society nominations for the leonard medal

Presentation of the 1986 LEONARD MEDAL to DR. RALPH B. BALDWIN

Presentation of the 1986 LEONARD MEDAL to DR. RALPH B. BALDWIN

The meteoritical society nominations for the Leonard Medal

The meteoritical society nominations for the Leonard Medal

Award of THE LEONARD MEDAL

Award of THE LEONARD MEDAL

The Meteotheritical Society nominations for the Leonard Medal

The Meteotheritical Society nominations for the Leonard Medal

Citation on the Award of the Leonard Medal of the Meteoritical Society to Johannes Geiss University of Bern

Citation on the Award of the Leonard Medal of the Meteoritical Society to Johannes Geiss University of Bern

Citation on the Award of the Leonard Medal of the Meteoritical Society to Dr. Robert N. Clayton The Enrico Fermi Institute The University of Chicago Chicago, Illinois

Citation on the Award of the Leonard Medal of the Meteoritical Society to Dr. Robert N. Clayton The Enrico Fermi Institute The University of Chicago Chicago, Illinois