Dajczer is professor of mathematics at the Instituto de Matematica Pura e Aplicada (IMPA), Rio de Janeiro, Brazil. He has made several important contributions in Riemannian geometry. His work has dealt especially with many aspects of the rigidity and deformation problem for isometrically or conformally immersed submanifolds in Riemannian ambient spaces. A member of the Brazilian Academy of Sciences, he has been a Guggenheim fellow and a fellow of the Japan Society for the Promotion of Science.

Chela-Flores was educated in Caracas and London. In 1969, he obtained a PhD in physics at the University of London. He has been a Visiting Scientist at the Abdus Salam International Centre for Theoretical Physics (ICTP) in Trieste, Italy, since 2014, where he had previously covered other positions: Staff Associate (1996-2014), Scientific Consultant (1990–1996), Visiting Scientist (1982–1989) and Associate Member (1972–1976). He is Professor Titular ad honorem and a founding member of the Institute for Advanced Studies of Caracas, and was a Research Associate at the School of Theoretical Physics of the Dublin Institute for Advanced Studies (1994–2019). He was Associate Researcher at the Venezuelan Institute for Scientific Research (IVIC) (1971–1978), and, at the University Simon Bolivar of Caracas, he was both Dean for Research (1979–1985) and Professor (1978–1990). He was awarded the Order Andres Bello by the Venezuelan Government. He is a member of the Latin American Academy of Sciences; and a Foreign Corresponding Member of the Venezuelan Academia de Ciencias Fisicas, Matematicas y Naturales.

Cheetham is Goldsmiths' Professor of Materials Science at the University of Cambridge, UK. He has been: Director, Materials Research Laboratory, UC Santa Barbara; Reader and University Lecturer, University of Oxford; E. P. Abraham Cephalosporin Junior Research Fellow, Lincoln College, Oxford. He has contributed extensively to research on advanced materials, including magnetic oxides, defect structures, porous solids and catalysis. His work on open framework inorganic and hybrid materials is particularly noteworthy. His honours include: Corday-Morgan Medal, Royal Society of Chemistry, London; Chaire Blaise-Pascal, Paris; Leverhulme Medal, Royal Society; TWAS Medal lecturer; Raman Professor, IAS; Honorary Doctorates, Versailles, St. Andrews and Tumkur Universities. His membership includes Royal Society, London, Pakistan Academy of Sciences, Indian Academy of Sciences and the Leopoldina.