| President, Zeliangrong Students Union, Kohima (1975-1979) |
| General Secretary, Zeliangrong Action Committee (1982-1986) |
| General Secretary, Zeliangrong Youth Organisation (1982-1985) |
| President, Peren District Youth Congress, Indian National Congress |
| Elected to 7th Nagaland Legislative Assembly from Tening A/C (1989) as NPC candidate; Minister for Information & Public Relations, Tourism, Parliamentary Affairs (1989-1990) |
| Re-elected to 8th Nagaland Legislative Assembly from Tening A/C (1993) on INC ticket; Minister for Relief and Rehabilitation (1994-1998) |
| Re-elected to 9th Nagaland Legislative Assembly from Tening A/C (1998) on INC ticket; Minister for Forest, Environment and Wildlife (1998-2003) |
| Re-elected to 10th Nagaland Legislative Assembly from Tening A/C (2003) on INC ticket; Minister for Geology & Mining (2003-2004) |
| Member of Rajya Sabha (2004-2008) |
| Re-elected to 11th Nagaland Legislative Assembly from Peren A/C (2008) on NPF ticket; Minister for Planning & Co-ordination, Evaluation, Veterinary and Animal Husbandry, Parliamentary Affairs |
| Re-elected to 12th Nagaland Legislative Assembly from Peren A/C (2013); Minister for Planning & Co-ordination, Evaluation & Geology & Mining (2013) |
| Chief Minister of Nagaland (24/05/2014 - 19/02/2017) |
| Chief Minister of Nagaland (19/07/2017 - 06/03/2018) |
| MLA from Peren constituency since 2008 |
| Deputy Chief Minister of Nagaland (since 07/03/2023) |
| Cabinet Minister for Planning and Transformation, National Highway (since March 2023) |
| Contested Nagaland Assembly elections (1982) - lost |
| Formed Nagaland Congress Party (27/06/2003); merged with Naga People's Front (30/06/2003) |