Shantanu was born in Lucknow, where his father came from a Bengali musical family. He was very young when he moved to Delhi with his family, where initially he lived in Patel Nagar in West Delhi, and studied at Springdales School, Pusa Road. There, he was the leader and singer of a band, and in 1982, the band hosted the school's first rock show. "What was even better was receiving an award in school for my contribution to music at a time when my school, Springdales in Delhi, didn't usually give awards for music. When I look back now, I think the award instilled huge confidence in me," he said.