Professor Srivastava began his university-level teaching career in 1959 itself at the age of 19 years. Currently, Professor Srivastava holds the position of a Professor Emeritus in the Department of Mathematics and Statistics at the University of Victoria in Canada. He joined the faculty there in 1969 first as Associate Professor (1969-1974) and then as Full Professor (1974-2006). Professor Srivastava has held (and/or currently holding) numerous positions of Visiting Professor and Chair Professor including (for example) those at West Virginia University in U. S. A. (1967{1969), Universite Laval in Canada (1975), and the University of Glasgow in U. K. (1975{1976), and indeed also at many other universities and research institutes in different parts of the world.

Professor Srivastava has published 26 books, monographs and edited volumes, 30 book (and encyclopedia) chapters, 45 papers in international conference proceedings, and more than 1,100 scientific research journal articles on various topics of mathematical analysis and applicable mathematics.Currently, he is actively associated editorially with over 200 international scientific research journals.

Professor Srivastava's over 57-year career as a university-level teacher and as a remarkably researcher in many dierent areas of the mathematical, physical, and statistical sciences is highlighted by (among other things) the fact that he has collaborated and published joint papers with as many as 500 mathematicians, physicists, statisticians, chemists, astrophysicists, geochemists, as well as information and business management scientists, who are scattered throughout the world, thereby qualifying for his Erdos number 2, implying that at least one of Professor Srivastava's co-authors is a co-author of the famous Hungarian mathematician, Paul Erdos (1913-1996). Professor Srivastava's collaboration distances with other famous scientists include his Einstein number 3, Polya number 3, von Neumann number 3, Wiles number 3, and so on.

Vladimir V. Rumyantsev is Head of Department of Theory of Complex Systems Dynamic Properties at A.A. Galkin Donetsk Institute for Physics and Engineering (DonIPE). He is Professor of Theoretical Physics and Nanotechnology Department at Donetsk National University (DonNU). He received PhD in Theoretical Physics (1988) from DonNU and Dr. Sci. in Condensed Matter Physics (2007) from DonIPE. Prof. Rumyantsev has authored/co-authored 4 books, 2 chapters in books and more than 280 scientific publications. He is a member of the American Physical Society as well as Mediterranean Institute of Fundamental Physics (MIFP, Italy)  and  Editor-in-Chiff of Journal of Photonic Materials and Technology (Science PG, USA).