Jerwood took holy orders in 1911 and first served as curate at All Saints' Church, Northampton. He became chaplain at Oakham School (1914–37) where he commanded the OTC. In July 1914 he married Lilian West at Little Bowden. In 1938 he accepted the benefice of Mountsorrel. He became rector of Burton Overy from 1945 until his retirement in 1958.[5][6]