Facts:   - residence: oshawa , ontario    - successor: john gray    - spouse: fred -lrb- dec. 2011 -rrb-    - predecessor: allan mason    - office: mayor of oshawa , ontario      - term end: 2003    - children: 1    - term start: 1991    - birth date: 1941    - name: nancy diamond    - birth place: sudbury , ontario    - occupation: administration   Based on these bullet points, write a short biography describing the life of nancy diamond .
nancy diamond -lrb- born -rrb- is a municipal politician in ontario , canada .she served as mayor of oshawa from 1991 to 2003 .previously she was as a city councillor from 1988 to 1991 .in 2010 , she returned to council and presently serves as a city and durham regional councillor .