Work Tenure – December 02, 1989 to November 10, 1990 } Shri Vishwanath Pratap Singh served as Prime Minister of India from 1989 to 1990. The Mandal Commission Report was implemented and the Scheduled Caste and Scheduled Tribe Act of 1989 was passed during his tenure. Born on June 25, 1931 at Allahabad, Shri V.P. Singh is the son of