P. S. Ramanujam, Professor Emeritus in Optics at the Technical University of Denmark, was born in Tamilnadu, India, and has lived in Denmark for more than 40 years. Besides a significant number of scientific articles in peer-reviewed journals, he has also written several articles on Tranquebar and is coauthor of Videnskab, oplysning og historie i Dansk Ostindien (2020), a book on the Norwegian astronomer, scientist, historian, philosopher, and reformer in Tranquebar Henning Munch Engelhart.