Harjinder Singh Dilgeer (or Harajindara Siṅgha Dilagīra) is considered an authority on Sikhhistory and philosophy . He has written in detail about the concept and the history of Akal Takht Sahib, Sikh culture, Shiromani Akali Dal, the history of Anandpur Sahib, and Kiratpur Sahib, Dictionary of Sikh Philosophy etc. The Sikh Reference Book is his magnum opus. 'The Sikh Reference Book' is an encyclopaedia consisting of more than 2400 biographies, complete chronology of Sikh history, 400 concepts of Sikh philosophy as well more than 800 Sikh shrines. He has produced a Sikh Encyclopaedia CD-ROM. His latest works are Encyclopaedia of Jalandhar (English), Banda Singh Bahadur (Punjabi and English), Sikh Twareekh in five volumes (a complete Sikh history, from 1469 to 2007, in Punjabi), and English translations of Nitnaym (the Sikh daily prayer) and Sukhmani Sahib.
Dilgeer was born in the family of Gurbakhsh Singh and Jagtar Kaur, at Jalandhar, Punjab, India. in a family originally from Jaisalmer, in Rajasthan, then Mehraj village (now in Bathinda district). He was later based in Jalandhar and Jalalabad (Firozpur), and finally in Oslo. He is a citizen of Norway, and, presently lives in England.
In 1971, Dilgeer passed his M.A. in English, and Punjabi and Philosophy (in 1973 and 1978 respectively) and started teaching in various colleges in the Punjab and finally at the Panjab University Chandigarh. He was awarded degrees of M.Phil. LL.B. and Ph.D. by Panjab University Chandigarh. Besides he has several other degrees and diplomas as well. He is visiting teacher of the P.U. Patiala as well.
In Denmark in 1995, he was presented with the 'Shan-i-Punjab' award; in 2004 he won the 'Giani Garja Singh Award' in Ludhiana; in 2005, he was presented with the 'Kohinoor Award' and 'National Professor of Sikh Studies' award in Birmingham (England); in 2006 he won the 'Bhai Gurdas' award in Amritsar; and in 2009 he was presented with the 'National Professor of Sikh History' award at Chandigarh.