Hartford Union High School Alumni
Hartford, Wisconsin (WI)
Mary Jean Sienko (Mary Jean O'Brien)
Hartford Union High School
Class of 1974
→ Join 2946 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.
Dolly Scelza
Class of 1963
Matthew Kavanaugh
Class of 1990
Robbe Royce
Class of 1975
Cindy Grinwald
Class of 1983
Jane Reis
Class of 1967
Steven Spaeth
Class of 1982
Ron Martinez
Class of 1988
Pam Murray
Class of 1970
Michele Hill
Class of 1997
Wayne Wagner
Class of 1983
Matthew Klink
Class of 1996
Laura Kohnhorst
Class of 1976
Emily Taugher
Class of 1998
Emily Smith
Class of 1989
Nancy Diaz De Leon
Class of 1973
Joseph Warniak
Class of 1994
Robert Guenther
Class of 2000
Keri Berling
Class of 2000
