Born in Argentina in 1958, close to Iguazu Falls, I first studied engineering followed by medical physics in Buenos Aires, where I have also worked at the National Academy of Medicine. In 1985 I moved to Paris. At the Universities of Toulouse and Paris I took a master and PhD degree in medical physics (dealing with stereotactic radiation therapy) and I then got a permanent position at Curie Institut under the direction of Jean Claude Rosenwald. In 1990 we started the protontherapy project in Orsay, where I was appointed as technical director covering the medical physics and engineering fields for about 8 years. I took some sabbaticals in US, at Indiana University Cyclotron Facility and at Massachusetts General Hospital & Harvard Medical School as invited scientist. In 2005 I have been in charge of the call for bids for the new protontherapy project in Orsay as the project director, in 2008 named head of medical physics at Curie Institute and in 2010 I have been elected as Chairman of the Particle Therapy Cooperative Group (PTCOG).