He has promoted the integration of biological, clinical and environmental knowledge and methods in health research and teaching, which he has conducted internationally; notably, in Spain, at the University of North Carolina at Chapel Hill, Harvard, Imperial College London, and several other universities in Europe, North America, Kuwait, and Brazil.
He was then awarded a Fulbright scholarship to pursue the Master of Public Health (MPH) program at UNC, where he was later a Burroughs Wellcome Postdoctoral Fellow in Pharmacoepidemiology.
He has acted as a grant and doctoral thesis reviewer for the Karolinska Institutet, the Finnish Academy, Diabetes UK, and several other European and American scientific organisations.
[12] Beyond his main lines of research, he has written on topics such as causality[13] and the Bovine spongiform encephalopathy (BSE) / Creutzfeldt–Jakob disease (vCJD) link,[14][15] persistent organic pollutants and public health,[16][17][18][19][20] genome metaphors,[21] the bibliographic impact factor and scientific journals,[22][23][24][25] or the roles of scientific associations,[26][27] among other issues.
[42] In 2018 he published his first book addressed to the general public on human internal contamination and ways to prevent it.