Sumit Singh is a topper at All India Institute of Medical sciences and a BL SONI Gold Medal Awardee at AIIMS joined the institute as a Faculty in the year 2000. He established the first Headache clinic in India in the government Sector in AIIMS in the year 2002.

He is a known expert in headache disorders and has been instrumental in co authoring the headache management guidelines for the Indian subcontinent. He started the usage of Botulinium toxin for headache for the first time in India in 2002 and extended its usage in patients in trigeminal neuralgia.