He discovered aquaporins, which are water-channel proteins that move water molecules through the cell membrane. They are integral membranes proteins from larger families of major intrinsic proteins, which form pores in the membrane of biological cells. Peter wasn’t always good at chemistry. When he first had chemistry he received a ‘D’ in that class. Later on he, of course, became very distinguished in that class with the help of his father who was a chemistry professor. Peter, along with his two brothers was Eagle Scout and a recipient of the Distinguished Eagle Scout Award.