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.

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.

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.