Prem Singh became influenced by the on-going religious, marriage, and educational reforms of the
Singh Sabha movement, especially by the
Chief Khalsa Diwan. Prem Singh began authoring poems that were published in the
Khalsa Samachar.),
Ranjit Singh (1918),
Nau Nihal Singh (1927),
Hari Singh Nalwa (1937),
Sher Singh (1951),
Nawab Kapur Singh (1952). He started but never completed his works covering
Bhai Gurdas,
Sukha Singh, and
Duleep Singh. Prem Singh was also a contemporary of
Giani Gian Singh, another Sikh writer. In 1937, the personal library of Prem Singh contained 1,840 rare books in Punjabi, English, Hindi, Urdu, and Persian languages, 130 manuscripts, 60 coins from various princely states, and a collection of 200 photographs. In 1939, he was appointed as the president of the Sikh Historical Society. Aside from dedicated biographical works on single personalities, he also authored works containing numerous biographies, such as his
Khālsā Rāj de Usrayye ("Builders of the Khalsa Raj", Vol. I in 1942 and Vol. II in 1944), and
Khālsā Rāj de Badesī Kārinde ("
Foreign employees of the Sikh Kingdom", 1945). In 1948 after the partition of Punjab, his family shifted Shimla and then to Patiala in 1949. == Later life and death ==