Robin W. Carrell is a medical researcher from New Zealand whose studies, defined and named the serpins, a family of proteins that control key functions in life. With colleagues, he elucidated the structure of more than 20 serpins and demonstrated how their ability to change their shape modifies their function. He showed how this enables serpins to modulate cellular functions, most notably in the blood, including control of coagulation, carriage of hormones and regulation of blood pressure.