Dr. Yeon-Gil Jung is a professor of Materials Science and Engineering at Changwon National University, Republic of Korea. He received his B.S, M.S, and Ph.D. degrees from Hanyang University, Republic of Korea. After that, he studied material property evaluation using Hertzian Indentation at NIST (National Institute Standard and Technology) with Dr. Brian Lawn during 1997-1999. He joined Changwon National University in 1999. He has been a visiting scholar and research professor 2013 - 2017 at Indiana University - Purdue University Indianapolis.