He succeeds YS Malik, who has been appointed as the Secretary, Road Transport and Highways, NHAI said in a statement.
Kumar is a 1984 batch IAS officer of Bihar Cadre, who has held important positions in the Central government and the Bihar government.
A B Tech in Civil Engineering from Indian Institute of Technology, Delhi, he has experience in the fields of urban development, tourism, health & family welfare, education and general administration.
Prior to this, he was Director General Employees' State Insurance Corporation (ESIC) under Ministry of Labour and Employment.