Assertion: brown's father | /r/CapableOf | write textbook
Facets:
value: until his retirement in 1997
type: TEMPORAL
value: from 1968
type: TEMPORAL
Source sentences:
text: He grew up on the campus of Phillips Exeter Academy, where his father, Richard G. Brown, was a teacher of mathematics and wrote textbooks from 1968 until his retirement in 1997.