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.
Naomi Tappero
Class of 1974
Jenny Wolf
Class of 1999
Jessica Schraufnagel
Class of 1999
Jolene Hasslinger
Class of 1995
Randy Heimerl
Class of 1975
Karen Hill
Class of 1960
Mary Kaul
Class of 1974
Brandon Kielisch
Class of 2006
David Ebert Ii
Class of 1983
Michelle Brushaber
Class of 2006
Michael Coomer
Class of 2006
Robert Buchanan
Class of 1983
Heather Korpela Hilgendorf
Class of 1999
Rick Gundrum
Class of 1975
Dale Wolf
Class of 1973
Judy Schraufnagel
Class of 1983
Vincent Hoffman
Class of 2008
Jenna Pietsch
Class of 1999
