In 1980 he took over as managing trustee of the Kisan Trust and Editor-in Chief of its publications: Asli Bharat (Hindi Weekly newspaper), Asli Bharat (Urdu weekly magazine) and Real India (English weekly magazine). These journals were Oppositionist papers devoted to espousing the cause of rural India, hence their names. The Hindi weekly newspaper (later converted into a monthly magazine) won a wide and devoted readership, particularly in rural areas of the Hindi heartland. As a monthly, it was acclaimed as one of the leaders in “alternative” journalism as opposed to the “mainstream”. As Managing Trustee of the Kisan Trust, he worked closely with veteran Socialist leaders Madhu Limaye and George Fernandes, Shri Biju Patnaik, Karpoori Thakur Bihar, Biju Patnaik (Orissa) and Mulayam Singh Yadav. His close colleagues were Sharad Yadav, Ram Vilas Paswan among others. They were all Trustees of the Trust and its chairman was Ch Charan Singh. After Charan Singh's death in 1987, all the veteran leaders unanimously elected him Chairman in his place. He was elected to the Legislative Council of Uttar Pradesh unopposed in 1986. In 1989 he won the Lok Sabha Parliamentary seat from Agra defeating a family that had held the seat since Independence. He served as Union Deputy Minister for Railways in Mr VP Singh's government. He later served as Chairman of the Centre for Cultural Resources and Training (CCRT), an autonomous body with the Human Resources Ministry. Later as chairman, Governing Body of the Sri Aurobindo College, Delhi University. In 2005 he was appointed India's High Commissioner to Fiji Islands, Tonga, Tuvalu and Cook Islands. A rare honour because his father had held the same post thirty years earlier. He served there till June 2007. Besides being a sportsperson, a journalist/editor of prominent journals, a member of UP's Legislative Council, of the Lok Sabha, a Union Minister, an educationist, and a diplomat, Ajay Singh has been asked by elders of his community to head their organisations. He was the Member of Parliament from Agra constituency in 1989. He was minister of state for railways in the Indian government in 1989 and 1990. On 14 July 2005, he was also appointed as the High Commissioner of India to the Government of Tuvalu. On 30 March 2013 from 11.00 am to 4.00 pm.