K. S. Chandrasekharan was an influential Indian mathematician known for his contributions to the fields of number theory and mathematical analysis. He was born on December 15, 1930, and made significant advancements in the study of modular forms and analytic number theory. His work has been recognized for its depth and originality, impacting both theoretical and applied mathematics. Chandrasekharan served as a professor at various institutions, including the Indian Institute of Technology and the University of Madras. He was also associated with the Tata Institute of Fundamental Research, where he contributed to mathematical research and education. His legacy continues to inspire mathematicians in India and around the world.