J. Maxwell Granger, son of John Granger and his wife Mary, was an associate member of the (British) Institution of Civil Engineers. In 1908 he worked in the Office of Examination of Bridges of the Cape Government Railways, Cape Town. That year he delivered a paper on "Bridge loadings and stresses" before the Cape Society of Civil Engineers. The paper was published in the society's Minutes of Proceedings (1908, Vol. 6). Granger was a member of the society, and in 1910 served as its honorary secretary. In 1913 he worked for South African Railways and Harbours (created after the Union of South Africa was formed in 1910), and was stationed at De Aar, Cape Province. At that time he was still a member of the society, which had been renamed the South African Society of Civil Engineers. He remained with the South African Railways until his retirement and during at least his last years lived in Johannesburg.
Granger was survived by his wife, Lynette Cave Granger, born Brown. They had no surviving children.