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He Castellsagué graduated in Medicine from the Autonomous University of Barcelona in 1983, completed his Master's and Doctorate in Epidemiology and Public Health at Yale University in 1991, and his postdoctoral stay at the International Agency for Research on Cancer (IARC) in 1991-92. His most relevant area of ​​work focused on the study of the human papillomavirus (HPV) and cervical cancer, the implications of the virus in other genital tumors and especially in oropharyngeal tumors, vaccination studies against HPV and studies of the impact of nutrition and certain nutrients on cervical carcinogenesis.<ref name=Scielo>{{REFjournal

Xavi Castellsagué was a professional always motivated by intervention and prevention. In his post-graduate years he worked with Doctors Without Borders and other non-governmental organizations in India, Burkina Faso and Cameroon. Later, already installed in Barcelona, ​​he attended the refugee camps of the Balkan war, and directly or supported by his fantastic daughters participated in the reconstruction of a school affected by the earthquakes in Nepal, among other solidarity activities in Brazil, Nicaragua, Guatemala and Palestine.<ref name=Scielo/>

Being an expert on infections and cancer, chances are that he Castellsagué caught early attention of [[circumfetishist]] [[Brian J. Morris]], who won him in support of his flimsy papers. So Castellsagué co-authored at least these for Morris: