Dr. Guerrero began his professional activity in the field of Polymer Science, after having received his Ph.D. from Bristol University in 1980. He taught engineering students in a Materials Science Department for seven years, then moved to a career in an international oil company. In 2009 he completed an M.A. in Global History from Warwick University, U.K., and then a Ph.D. in History from McGill University, Montreal, Canada.

His field of research is the history of silver refining in the Hispanic New World, which has now branched out into the environmental consequences of the global production and use of mercury from the 16^th to the 19^th centuries.

Since 2019 he has been a Visiting Fellow of the School of Culture, History and Language of the Australian National University, thanks to the sponsorship of Dr. Larissa Schneider, with whom he is working on the global trade and Australian imports of mercury in the 19^th century. In addition to articles, he has published a book titled Silver by Fire, Silver by Mercury: A chemical history of silver refining in New Spain and Mexico, 16^th to 19^th Centuries, Leiden: Brill, 2017. He is also the author of a capsule section titled ‘Mercury and Silver: A History of Unexpected Environmental Consequences’, in Chapter 11 of Ecotoxicology, by Pamela Welbourn, David Wright, Peter Hodson and Peter Campbell, to be published by Cambridge University Press, in June 2022.