Prof. Darshan Singh Khalsa (also referred to as Singh Sahib - his title when in seva at Shri Akal Takhat) is a well known Sikh keertani and a prolific author. An ex-Jathedar of the Shri Akal Takhat Sahib, he is married to Bibi Manjit Kaur. He currently resides in Toronto, Ontario, Canada. The Sangat usually refers to him as professor due to his teaching style of the Guru Granth Sahib ji.