(If you feel hard to pronounce my name, you can call me 'DK')DongGyun is a research student at the Centre for Research on Evolution, Search and Testing (CREST) in Software Systems Engineering Group, Department of Computer Science, University College London. He is currently working under supervision of Dr. Jens Krinke and Prof. Mark Harman. He was a researcher at the knowledge convergence team at KAIST Institute for IT Convergence. He received his MPhil. in the Department of Computer Science & Engineering at the Hong Kong University of Science and Techonlogy under supervision of Dr. Sunghun Kim. He received B.Eng. in Computer Engineering Department at the Jeju National University under supervision of Prof. Hoyoung Kwak. His research area is Software Engineering, mainly focusing on modern code review, defect prediction, repository data mining, and empirical studies.