Klaas de Groot (born 3 November 1940, Bergen, Limburg) is Emeritus Professor at the Tissue Engineering Group at the University of Twente. In the past he also worked as a visiting scientist at the UCLA bone research laboratory. His work has focused on the research and development of bioceramics that resemble the composition of bone. He has developed two types of bioceramic, namely bulk ceramics (dense, porous, large and small) for mechanically unloaded bone fillers, and coatings for improving the bone bonding of strong, but less biocompatible, metallic orthopedic and dental implants. His group also studied the incorporation of drugs and growth factors such as Bone Morphogenetic Proteins (BMP) into such ceramics and coatings, as well as the use of calciumphosphate particles for plastic surge