After achieving the Medical Degree at Barcelona University did the Plastic Surgery training at Sant Pau University Hospital in Barcelona. He completed his training doing fellowships in Canniesburn Hospital (Glasgow-UK) and in Queen Victoria Hospital (East Grinstead-UK).
In 1998, he introduced DIEP flaps for breast reconstruction in Spain. He got a post as consultant in plastic surgery at Sant Pau University Hospital in 2001. Two years later became the Chief of Microsurgery Unit and in 2005 he won the position as Chief of Plastic Surgery Department and Full Professor in Surgery at Universitat Autonoma de Barcelona.
Prof. Masia was President of the Spanish Society of Plastic Surgery from 2011-13 and after he become the President of Spanish Society of Plastic Surgery Foundation for Education. From 2010 he is the Director of the International Master Degree on Reconstructive Microsurgery at Universitat Autonoma de Barcelona. He has been invited as lecturer and visiting Professor in more than two hundred international meetings in plastic surgery. Author of more than 100 peer-review papers and books; his current main interests are perforator flaps, breast reconstruction, lymphedema surgery and medical education.