Elected F.R.S. 1960
Derman Christopherson was characterized principally by his kindness and humanity, recognized by all who knew him, in any capacity. Those who came into contact with him professionally soon appreciated his physical insight and his versatility—he was equally at home with solid and fluid mechanics and he had considerable mathematical skills. He recommended to his graduate students that success came from the ability ‘to bring home the bacon in a number of fields’. He was an inspirational supervisor—informal, personal, friendly. In relatively few papers he contributed significant applications in elasticity, plasticity and viscous flow, and pioneered the application of Southwell's relaxation method to the solution of engineering problems.