Congratulations to "Prof. Dr. Pimchai Chaiyen" on receiving the 2019 Professor M.R. Jisnuson Svasti Outstanding Protein Scientist of Thailand Award. Dr. Chaiyen is passionate about science and believes that science and technology are vital for the development of the Thai economy and society. Her group studies flavin-dependent, PLP-dependent, redox and aldolase enzymes. They have contributed significantly to the understanding of many fundamental aspects of these systems including mechanisms of oxygen activation by flavoenzymes, reduced flavin transfer between proteins, oxygenation and oxidation by flavin-dependent enzymes, in the process developing the use of pre-steady-state kinetics in Thailand. Their research contributes to applications in green chemistry, white biotechnology, biofuels, biorefinery, biosensors and bioimaging. The evaluation committees agreed to present the award this year to Dr. Chaiyen for her contribution in the broad area of enzyme catalysis, and application of this knowledge to enzyme engineering, systems biocatalysis, metabolic engineering, and systems biology.