| Authorised form of name | McConnell; James Desmond Caldwell (1930-2026); physicist |
| Dates | 1930-2026 |
| Nationality | British |
| Place of birth | Lisburn, Co Antrim, Northern Ireland |
| Date of birth | 03 July 1930 |
| Place of death | Cambridge, Cambridgeshire, England, United Kingdom |
| Date of death | 02 January 2026 |
| DatesAndPlaces | Funeral: East Chapel, Cambridge City Crematorium, Cambridge, Cambridgeshire, England, United Kingdom (20 January 2026) |
| Occupation | physicist |
| Research field | Quantum theory |
| Crystallography |
| Computational physics |
| Geology |
| Applied mathematics |
| Theoretical physics |
| Activity | Education: Queen’s University, Belfast BSc (1947-1952); University of Cambridge, Department of Mineralogy and Petrology M.A., Ph.D (1952-1955)
Career:
University Demonstrator in Mineralogy and Petrology, Cambridge University (1955-1960); University Lecturer in Mineralogy and Petrology, Cambridge University (1960-1972); founding Fellow and College lecturer in Crystallography (1962-1982);Tutor, Churchill College, Cambridge (1965-1972); Reader in Mineralogy, Cambridge University (1972-1982); Vice President, Mineralogical Society of London, Cambridge University (1977-1978); Visiting Professor, SUNY at Stoney Brook, NY (1977); Visiting Professor, Marburg University, W Germany (1979); Visiting Professor and ISPS Fellowship to Japan (1982); Head of the Department of Rock Physics, Cambridge (1983-1986); Extraordinary Fellow, Churchill College, Cambridge (1983-1988); Professor of the Physics and Chemistry of Minerals (1986-1995); Professorial Fellow of St. Hugh’s College Oxford (1986-1995); Head of the Department of Earth Sciences, Oxford University (1991-1995); Emeritus Professor of the Physics and Chemistry of Minerals (1995-2026); Honorary Fellow of St. Hugh’s College, Oxford (1995-2026); Visiting scientist at the Bayerisches Geoinstitut , Bayreuth (1997-1999); Return to Cambridge and Earth Sciences, Cambridge (2005-2026). |
| Membership category | Fellow |
| Date of election | 19/03/1987 |
| Age at election | 56 |
| Relationships | Parents: Samuel David McConnell and Cathleen (née Coulter) McConnell
Siblings: John, Margaret, and Irene
Spouse: Jean Elspeth Ironside (m. 14 July 1956)
Children: Craig Coulter, Deirdre Simmen, and Elspeth Jackson |
| PublishedWorks | RCN 34149 |
| OtherInfo | Brought ideas and techniques from modern solid-state physics and chemistry to bear on a broad range of mineral transformation behaviours. He furthered our understanding of ordering transformations in minerals - particularly the origin of incommensurate (IC) modulated structures - by applying group theory and symmetry principles generally.
Desmond's pioneering application of electron microscopy to mineralogy led to the first identification of antiphase structure, spinodal behaviour and other effects in feldspars, sulphides, pyroxenes and oxides.
His early work showed how kinetics gave evidence of the transformation mechanism.
His thermodynamic studies showed that IC modulated structures are nearly as well ordered as the pure end-member structures. At Schlumberger Cambridge Research, he elucidated various properties of shales. |
| Source | The Royal Society Fellows Directory, Professor James McConnell FRS, [URL: https://royalsociety.org/people/james-mcconnell-11917/; last accessed: 28/01/2026]
Curriculum Vitae, James Desmond Caldwell McConnell personal website, [URL: https://quantum-physics-revisited.co.uk/curriculum-vitae/; last accessed: 28/01/2029]
Funeral notices, Emeritus Professor James Desmond Caldwell McConnell, [URL: https://funeral-notices.co.uk/notice/mcconnell/5283253; last accessed: 28/01/2029] |
| Code | NA4561 |