Luis A. Rivera-Rivera is an Associate Professor at the Department of Physical Sciences, Ferris State University, USA. After completing his B.S. degree in chemistry at the University of Puerto Rico, Dr. Rivera went on to do an M.S. degree in inorganic chemistry, finally completing his Ph.D. in physical chemistry at Texas A&M University. After his Ph.D., he carried out postdoctoral research in theoretical chemistry and has published well over forty papers and given multiple presentations in this area. Jay R. Walton is Professor Emeritus at the Department of Mathematics, Texas A&M University, USA. He earned his Ph.D. from Indiana University, and was previously also Professor of Aerospace Engineering and Deputy Director of the Institute for Applied Mathematics and Computational Science at the university. He has published over 90 research papers.