Naokant Deo is a professor at the Department of Applied Mathematics, Delhi Technological University, New Delhi, India. He completed his Ph.D. in Mathematics from Guru Ghasidas Vishwavidyalaya, Bilaspur, Chhattisgarh, India. His areas of interest include real analysis and approximation theory with a focus on positive linear operators. Professor Deo is a recipient of the CAS-TWAS Fellowship awarded by the Chinese Academy of Sciences, Beijing, China, and the International Centre for Theoretical Physics, Trieste, Italy. He is an active member of the Indian Mathematical Society, India, and Research Group in Mathematical Inequalities and Applications, Australia. His research works have appeared in prestigious national and international journals.

Ryozi Sakai is a renowned researcher at the Department of Mathematics at Meijo University, Aichi, Japan, since 2009. Earlier, he had been enjoying a successful career as a senior high school teacher from 1968-2003. His main research area is polynomial approximation theory. Born in 1943, in Miyazaki, Japan, he received a Doctor of Science (Mathematics) degree from Kanazawa University in Japan, in 1992. Dr. Sakai has published numerous research papers in esteemed journals throughout his career.