PSU MantraFormer ONGC CMD Dr. Alka Mittal met ONGC Chairman & CEO Arun Kumar Singh at DUB. by NewsmantraJune 19, 2023June 19, 2023 Share0 Former ONGC CMD Dr. Alka Mittal met ONGC Chairman & CEO Arun Kumar Singh at DUB. Together they discussed ways to further strengthen ONGC’s legacy of excellence & drive sustainable growth in the energy sector.