In 1967 he defended his candidate's dissertation in the philosophy of science.

After all, one day you may find yourself sitting before a committee of faculty members vigorously defending your dissertation or master's thesis.

Yesterday, at the age of 54, he completed the process by defending his dissertation.

Yet he did not defend his doctoral dissertation until 1980, when he was 50 years old.

This year he is going to defend a Candidate's dissertation.

After defending his dissertation he became a renowned scientist world-wide.

Together they were looking forward to the day, later this month, when their son would defend his doctoral dissertation.

He defended his doctor's dissertation at the same faculty in 1985.

And you will be there when she defends her dissertation.

Sue was a scientist and was six weeks away from defending her dissertation.