Vincent Eijsink, originally from The Netherlands, is Professor of Biochemistry at NMBU, the Norwegian University of Life Sciences, in Ås, Norway. For many years his group has been working on enzymes that degrade recalcitrant polysaccharides such as chitin and cellulose. The group is famous for the discovery of a new class of enzymes, currently called Lytic Polysaccharide Monooxygenases (LPMOs), which use oxidative chemistry to cleave glycosidic bonds. These mono-copper and otherwise cofactor free enzymes are abundant in Nature, carry out unprecedented chemistry, have great industrial potential, and likely possess additional functionalities that remain to be discovered. Recent work has revealed that LPMOs also, or primarily, carry out peroxygenase reactions, raising novel fundamental and applied research questions that are currently being pursued.