Born in Madrid, 1943. Graduation (1965) and Ph.D (1969) in Physics, Universidad Complutense, Madrid. Since 1967 has realized long duration stays (> 3 months), adding to more than 12 years, at the European Laboratory for Elementary Particle Physics (CERN, Geneva, Switzerland), at the Brookhaven National Laboratory (BNL, New York, USA) and at the Collège de France (Paris, France) and numerous short and medium duration stays at CERN, at the Deutsches Elektronen Synchrotron (DESY, Hamburg, Germany), at the Lawrence Berkeley National Laboratory (LBL, Berkeley, USA), at the Massachusetts Institute of Technology (MIT, Boston, USA), at the Kennedy Space Center (KSC, Cape Canaveral, USA) and at the Johnson Space Center (JSC, Houston, USA).
He has participated in High Energy Particle Physics experiments with bubble chambers and spectrometers at the PS and SPS accelerators at CERN and at the AGS accelerator at BNL (1967-1990), in the L3 experiment at the LEP-CERN collider (1989-2002) and in the CMS experiment at the LHC-CERN collider (1992-2014). From 1997-2013, he has been the CIEMAT Team Leader in the AMS experiment on board of the ISS. In this project he has played important roles, in particular, in the governance of the collaboration, as the scientist in charge of the Financial and International Committees and as responsible of the MoU between CERN and AMS and between the Institutes of the AMS Collaboration.
Since 1965, he has been associated to JEN-CIEMAT. Head of the CIEMAT Division of Particle Physics (1983-1988), Director of the Department of Fusion and Elementary Particle Physics and the Department of Basic Research (1988-2012). Guest Professor of the CERN Director General (2012-2013).
Member of the Particle Data Group (PDG) and one of the physicists in charge of the edition of the Review of Particle Physics and the Particle Physics Booklet (1981-2005). Spanish delegate at the European Committee for Future Accelerators (ECFA) (1983-1986). Member of the CERN Super Proton-Synchrotron Experiments Committee (SPSLC) (1987-198). Member of the Committee drafting the Spanish Steering Plan for High Energy Physics (1983). Scientific Manager of the National Program for High Energy Physics (1996-2000). Scientific Delegate of Spain (2000-2008) and Vice President of the CERN Council (2004-2007). Co-Founder, in 1973, of the annual International Meeting on Fundamental Physics (1973-2019). Promoter, in 1994, of the Division of High Energy Physics of the Royal Spanish Physical Society. Member of the High Energy Particle Physics Board of the European Physical Society (1998-2000). Member of the C11 (Particles and Fields) IUPAP Committee (2005-2011). Co-Chairman of the Local Organizing Committee of the 37th International Conference on High Energy Physics ICHEP 2014, which took place in Valencia on July 2014.
Fellow of the Juan March Foundation (1977-1978). National Award of the Royal Academy of Sciences (1980). Medal of the Royal Spanish Physical Society (1981). Scientist of the Year, Magazine CAMBIO 16 (1986). C.E.O.E. Award to Science (1997). Most cited Spanish scientist (Institute of Scientific Information (1981-2008)). Single Spanish scientist, working in a Spanish Institution, appearing in the list of the 100 most cited scientists in the world in the category of Physical Sciences (Institute of Scientific Information (2001)).
He has published more than 800 scientific papers in the more prestigious journals and presented numerous communications in national and international conferences. He has given more than 200 seminars in research centers and university departments. He has been the thesis advisor in twelve occasions.
On June 28, 2000 he was elected Member of the Spanish Royal Academy of Sciences. From 2014-2018, he has been President of the Physics and Chemistry Section of the Royal Academy of Sciences. Since 2018 he is Member of the Scientific Council of the Ramón Areces Foundation and of the Gadea Foundation for Science.