Professor Nalini Joshi has obtained international recognition for her fundamental work on the mathematical structure of nonlinear integrable systems. She has tackled longstanding unsolved problems concerning the delicate asymptotic structure of the solutions to key nonlinear integrable differential equations, using novel techniques in complex analysis. Her results have led to crucial information about singularity structure, and to improved tests for the identification of integrable systems. She has tackled traditional continuous systems where her results have brought a more unified understanding, and she is a pioneer in developing complex analytic techniques for the study of integrable discrete systems.