A. K. Nandakumaran received his Ph.D. from Tata Institute of Fundamental Research, Mumbai, India (TIFR). He served in TIFR for a brief period and later joined the Department of Mathematics, Indian Institute of Science as Assistant Professor, where he is currently serving as Professor. His areas of interest are partial differential equations, control and controllability problems, inverse problems and computations. He received the Sir C. V. Raman Young Scientist State Award in Mathematics in 23. P. S. Datti obtained his Ph.D. from Courant Institute of Mathematical Sciences, New York in 1985 under the supervision of Sergiu Klainerman. His main areas of research interest include nonlinear hyperbolic equations, hyperbolic conservations, ordinary differential equations, evolution equations and boundary layer phenomena. He has written Tata Institute of Fundamental Research (TIFR) Lecture Notes for the lectures delivered by G. B. Whitham (CalTech) and Cathleen Morawetz (Courant Institute). After serving in TIFR Centre for Applicable Mathematics for over 35 years, he retired in December 216. Raju K. George joined the University of Baroda as a faculty after completing his Ph.D. from Indian Institute of Technology Bombay. He served there for twelve years and later joined the Indian Institute of Space Science and Technology (IIST), Thiruvananthapuram, as Professor and Head of Mathematics. He was a visiting Professor at the University of Delaware 22??24. His research area includes functional analysis, mathematical control theory, soft computing and industrial mathematics.