The translation of the Bhagavad Gita verses are bySwami Nikhilananda, some by Swami Cidbhavananda, and a little by Nome in light of Adi Sankara’s bhasya (commentary).
The refrain of “Govindam Adi Purusham”, is inspired from the song, Govinda, by the Radha-Krishna Temple (London), produced by George Harrison.