Ferrar, was a contemporary of Sir Winston Churchill at Sandhurst and joined the Indian Army at the tender age of 20 in 1896. Ferrar opted to move to the CivilService and was inducted into the Punjab Commission. During the five years thathe was in the army, he studied Urdu, Persian, Arabic, Punjabi and Pashtu. In recognition of his proficiency in these languages he was appointed an examiner in Urdu at Cambridge University.
A keen naturalist and student of the butterfly fauna. He collected over 4000 specimens which are now in the Natural History Museum at London. Was in touch with other lepidopterists such as Brigadier W. H. Evans. Ferrargunj is named after him.