Yuan Kun Lee, PHD, is an Associate Professor in the Department of Microbiology at the National University of Singapore, where he researches fermentation and microbe-host interactions and probiotics. Dr. Lee has written ninety journal papers, sixty conference proceedings, twenty-eight book chapters, and three books. He is also the holder of three patents. Seppo Salminen, PHD, is a Professor in the Department of Biochemistry and Food Chemistry at the University of Turku in Finland. He is also a Visiting Professor of Food Toxicology at RMIT University in Australia. Prior to his academic career, Dr. Salminen worked as a nutrition specialist, project manager, and toxicologist for private industry and government agencies. Dr. Salminen has written more than 240 refereed publications, several book chapters, and five books.