earned his BSc degree in physics in 1977 from the University of São Paulo, Brazil; his MSc degree in nuclear engineering in 1980 from the Military Institute of Engineering, Rio de Janeiro; and PhD degree in biophysics in 1990 from the Federal University of Rio de Janeiro. He worked as a postdoctoral fellow at the University of Utah, Environmental Radiation Toxicology Laboratory from 1991 to1995. He has worked for more than 30 y in mathematical modeling of human metabolism regarding intake, distribution, retention and excretion of radionuclides for several age groups for internal dosimetry applications; scientific software design and development including software quality assurance procedures; and interpretation of monitoring data of radiation workers.

He is a retired Internal Dosimetrist from Los Alamos National Laboratory. He was responsible for calculating all internal doses and evaluating the efficacy of Prussian Blue for all age groups due to the Goiania radioactive accident in 1987. He has served the Program Area Committee 6 since 2014. He has served the International Commission on Radiological Protection as a member of the Task Group on Dose Calculations since 1995 and as a member of Committee 2. He is an active member of the EURADOS (European Radiation Dosimetry Group). He has served on the Scientific Advisory Committee for USTUR since 2014. He has published several peer-reviewed journal articles.