Antonio Ballesteros hold a PhD in Chemistry and a Master in Pharmacy from Complutense University of Madrid. From 1967-1969, he worked in the National Institutes of Health (USA) as a visiting scientist. He organized the Symposia on Enzyme Stability (1998) and on Environmental Biocatalysis (2006). He was Chairman (1996-2000) of the Working Party on Applied Biocatalysis. He is Executive Editor of the journal Biocatalysis and Biotransformation. He has worked with endonucleases, hydrogenases, lipases and glycosyltransferases.