Manmohan Singh, who has died aged 92, was the technocrat behind the economic reforms that led to India’s emergence as a world power, first as finance minister and latterly as prime minister of India from 2004 to 2014.

Manmohan Singh, former Indian Prime Minister and a pivotal figure in the country’s economic transformation, died in New Delhi on Dec. 26. He was 92.

Authorities in India have declared a seven-day mourning period to honor Manmohan Singh as politicians and public paid tributes to the country’s former prime minister widely regarded as the architect of India’s economic reform program.