WESTBOROUGH, MA Dr Sitansu Sekar Mittra passed away on Sunday, April 25, 2021, after a long illness. Dr. Mittra was born on October 3, 1937, in Calcutta, India and led a life of great academic success. At age 18 he won the prestigious Ishan Scholarship Award which allowed him to earn a BA and MA in Mathematics at Presidency College and the University of Calcutta respectively. His academic distinction was such that he was offered a position at the University of Calcutta's Department of Mathematics the day after he received his Master's degree in 1960. This led Dr. Mittra to become the youngest professor at the University of Calcutta's Department of Mathematics. Dr. Mittra continued his studies abroad and subsequently was awarded the prestigious Fulbright and Commonwealth scholarships. Dr. Mittra and his wife Pranati (Datta) relocated to Toronto, Canada, where he studied Non-Euclidean Geometry at the University of Toronto. After earning his second Master's he continued to build on his academic success, earning his Ph.D in Mathematics at Lehigh University in Bethlehem, Pennsylvania in 1970. Dr. Mittra took his expertise in mathematics to the burgeoning field of Computer Science. He began his career as a programmer at Pennsylvania's Bureau of Corrections. The young family moved to the Boston area in 1978. Over the next 40 years he continued in Computer Science as a working professional, teacher, and author. He wrote books on Database Theory, Expert Systems, and Oracle Database Tuning. He also wrote several articles and a book about 19th and 20th century Bengali history and literature, a lifelong passion along with Mathematics. Dr. Mittra leaves behind his loving wife Pranati (Datta) Mittra, his son Partha and daughter-in-law Claudia of Bronxville, NY and his other son Ansuman and daughter-in-law Sarah of Medford, MA. He also leaves behind his nephew Dev Kumar Roy of Miami, Florida and his niece, Ashoka Bose of Kolkata, India. Dr. Mittra will be deeply missed by the Bengali community of Massachusetts where Dr. Mittra and his family lived for 43 years. A time of visitation will be held from 9am to 10:30am, on Wednesday, April 28, 2021, at Hays Funeral Home, 56 Main Street, Northborough. Cremation will follow. All current Massachusetts Covid19 guidelines and protocols for social distancing will be followed. The wearing of masks will be required, please plan accordingly. To leave a condolence, please visit www.HaysFuneralHome.com.