Tuhin Mukherjee, PhD, is an Assistant Professor of Mechanical Engineering at Iowa State University. Previously he was a postdoctoral researcher in the Department of Materials Science and Engineering at the Pennsylvania State University, USA. He was awarded the American Welding Society Research fellowship and the Robert E. Newnham Research Excellence Award by Pennsylvania State University.Tarasankar DebRoy, PhD, is a Professor of Materials Science and Engineering at the Pennsylvania State University, USA. He previously held positions as a Fulbright Distinguished Chair in Brazil, Distinguished Visiting Professor at IIT Bombay, Aditya Birla Chair at IISc, Bangalore, UK Royal Academy of Engineering Distinguished Visiting Fellow at Cambridge University, and Visiting Professor at KTH, Stockholm.