He held the post until the Department of Ethics was abolished and its members absorbed into the Department of Philosophy in 1975 .
When Francis Sparshott stepped down as chairman of that department in 1970 , Graff was appointed to succeed him .
Graff held the post until the Department of Ethics was abolished and its members absorbed into the Department of Philosophy in 1975 .
When Francis Sparshott stepped down as chairman of that department in 1970 , Graff was appointed to succeed him .