[1] Unable to leave, he was brought up by his uncle and aunt, and in 1946 won a place to study mechanical science at Trinity College, Cambridge.
[1] He became a Fellow of Trinity College in 1962, and in the same year married a Norwegian student at Bell School named Helle Bang.
[2] After the business closed he worked as an independent consultant in hydrodynamics, including investigation of the sinking of the bulk ore carrier Derbyshire.
[2] In 1992 he and his family moved to Grimstad, and Grigson began lecturing at the University of Agder Engineering College, teaching hydrodynamics and basic physics.
[1][2] He published nearly 20 papers in the journal of the Royal Institution of Naval Architects before his death of cancer in Grimstad on 19 February 2001.