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.
Andrew Stein
Class of 1983
Leona Koch
Class of 1988
Loy Perkins
Class of 2008
Greg Braunreiter
Class of 1985
Jill Milbrath
Class of 1985
Jennifer Stewart
Class of 2000
Travis Wolfeil
Class of 2011
Amanda David
Class of 2004
Jennifer Peters
Class of 1992
Aaron Lawonn
Class of 2010
Christa Lucynski
Class of 1994
Heidi Herold
Class of 1991
Daryl Torn
Class of 2004
Ally Huckl
Class of 2008
Kasey Roskopf
Class of 1995
Dauna Hale
Class of 1970
Karen Neu
Class of 1982
Jeff Oosterhuis
Class of 1982
