Given the question: What key details about g. p. s. de silva  can be extracted from the following bio?  Bio: g. p. s. de silva was the 40th chief justice of sri lanka . he was appointed in 1991 and was chief justice until 1999 . he was succeeded by sarath n. silva .
The answer is:
- appointer is ranasinghe premadasa- successor is sarath n. silva- predecessor is herbert thambiah- office is 40th chief justice of sri lanka- term end is 1999- term start is 1991- name is g. p. s. de silva