Person Mackay; Alan Lindsay (1926 - 2025); crystallographer Mackay Alan Lindsay crystallographer 1926 - 2025 British Male Wolverhampton, Staffordshire, England, United Kingdom 06 September 1926 19260906 London, England, United Kingdom 24 February 2025 20250224

Crystallographer Education: Wolverhampton Grammar School (1935-1940); Oundle School (1940-1944); Trinity College, Cambridge (1944-1947); PhD (1951); DSc (1986) Career: Professor of Crystallography, Birkbeck College, University of London (1986-2025). Memberships: Fellow of the Mexican Academy of Sciences Fellow of Birkbeck College Parents: Mother and father were both physicians. Spouse: (m. 1951) Sheila Thorne Hague. Children: One daughter and two sons. His contributions to non-Euclidean crystallography have furthered our understanding of quasicrystalline and icosahedral phases. He predicted the occurrence of five-fold symmetry and computed the details of the diffraction patterns to be expected from such structures several years before they were observed experimentally. He is a leading authority on the geometry and symmetry of crystals and has made pioneering contributions to periodic minimal surfaces, packing in curved manifolds, and to incommensurate structures. He has elaborated the importance of the Penrose pattern for crystallography and demonstrated optically its Fourier transform. Alan has also made noteworthy use of quaternions in crystallographic calculations. Committees: Library Committee 1990-1995 Lectures: Bernal 2001 Fellow 17/03/1988 61 The Royal Society Fellows Directory, Professor Alan Mackay FRS, [URL: https://royalsociety.org/people/alan-mackay-11853/; last accessed: 23/04/2025] IUCr Newsletter, (2025) Volume 33, Number 2, Obituary, Farewell to Alan L. Mackay (1926-2025) - Scientist, Friend, Istvan Hargittai, [URL: https://www.iucr.org/news/newsletter/volume-33/number-2/farewell-to-alan-l.-mackay-1926-2025-scientist,-friend] International Standard Archival Authority Record for Corporate Bodies, Persons and Families - ISAAR(CPF) - Ottawa 1996 ISBN 0-9696035-3-3 National Council on Archives, Rules for the Construction of Personal, Place and Corporate Names, 1997 https://royalsocietypublishing.org/action/doSearch?ContribAuthorRaw=Mackay%2C+Alan+Lindsay RCN 45 RCN R80579 RCN 14383 RCN R75918 RCN 12131 RCN 12132 RCN 12133 RCN 17701 RCN 12183 RCN 4576 6 Sep 1926 - The past Fellows entries are under continuous revision. If you have queries or additional information to contribute, please contact Library@royalsociety.org. Content in external sources is not controlled by the Royal Society and historical sources may include content that is now unacceptable. Reviewed on 23/04/2025 as part of the Name Authority Project update. NA2384 21/11/2001 Andyg Pmab 09/09/2025 RS_NET\VidaM Yes 3e19a12b-bcc8-4056-917c-63c6df6cf316