Hartford Union High School Alumni
Hartford, Wisconsin (WI)
Mary Jean Sienko (Mary Jean O'Brien)
Hartford Union High School
Class of 1974
→ Join 2944 Alumni from Hartford Union High School that have already claimed their alumni profiles.
→ There are 75 classes, starting with the class of 1925 all the way up to class of 2022.
MARY JEAN'S PROFILE
| First Name | Mary Jean |
| Last Name | Sienko |
| Maiden Name | O'brien |
| Graduation Year | Class of 1974 |
| Gender | Female |
| City | N/A |
| State/Province | MI |
| Country | United States |
| Occupation | Veterinarian |
| Married | Yes |
Class of 1974 Alumni
→ Reunite with 32 class of 1974 alumni that have joined.
Britney Rummell
Class of 2002
Jody Ovrid
Class of 1988
Doreen Matheny
Class of 1983
Alison Clinton
Class of 2000
Daniel Miller Daniel Miller
Class of 1978
Wendy Allen
Class of 1996
Mary Kemmer
Class of 1984
Eric Scharpf
Class of 1993
Mike Mihalek
Class of 1995
Brenda Hansen
Class of 1985
Joseph Boldt
Class of 1999
Patricia Algiers
Class of 1972
Joel Ninmann
Class of 2003
Sue Koll
Class of 1971
Lisa Anderson
Class of 1984
Julie Wolf
Class of 1975
Eric Hanson
Class of 1985
Jennifer Walsh
Class of 1991
