During a career span of more than 33 years he has served in various capacities in his cadre state of Himachal Pradesh. He served as Additional Chief Secretary in various departments including Information & Public Relations, Finance, Vigilance, Coordination and Public Grievances to the Government of Himachal Pradesh, Shimla. He was also the Chairman of Himachal Pradesh State Electricity Board.
Mittal is a Law and Economics graduate and has done Post-graduation in Rural Development. He is proficient in Hindi, English, Punjabi& Urdu.