Prof. Singh is the Vice Chancellor of Nava Nalanda Mahavihara University, (Deemed University), Ministry of Culture, Government of India. In a permanent position, he is a Senior Professor in the Department of Pali & Buddhist Studies at Banaras Hindu University (B.H.U.), Varanasi, India. Prof. Siddharth Singh was also a Diplomat and Director of the Indian Cultural Centre, Embassy of India, Tokyo, from 2018 to 2022, where he worked extensively to promote Indian culture in Japan and strengthen the India-Japan soft-diplomatic relationships. He has also been the recipient of the Japan Foundation Fellowship, Japan (2003-04), Fulbright Senior Research Fellowship, USA (2011-2012), and Vadrayana Vyas President Award, India (2005).

Dr. Siddharth has published four books namely, Saddhammasangaho (History of Buddhism till 13^th Century) (Pub. by Motilal Banarsidass), Jinacarita (Biography of the Buddha) (Pub. by Pilgrims Publishing House, Delhi), Zen Bauddha Dharma-Sangeet (Pub. by Sahitya Bhandar, Allahabad) and Remembering the Legend: Kosetsu Nosu (Pub. by Mahabodhi Society of India). He has published more than 80 papers in Hindi, English, and Japanese encompassing various aspects of Indian Culture and Buddhism and delivered lectures and presented several National and International papers on different occasions in India and countries like the USA, Japan, China, Sweden, Estonia, Thailand, Singapore, Sri Lanka, Myanmar, Vietnam and Nepal etc.