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.
Kathy Grover
Class of 1983
Chris Peiffer Wenzel
Class of 1985
Christopher Thomas
Class of 1982
Casey McMahon
Class of 2006
Brittni Kelsey
Class of 2005
Shirley Jischkowsky
Class of 1961
Patti Cardenas
Class of 1996
Lisa Stills
Class of 1989
Robbe Royce
Class of 1975
Jessica Schultz
Class of 2003
David Lisowski
Class of 1993
Michele Skopek
Class of 1997
Max Werner
Class of 2010
Thomas Wagar
Class of 1985
Robert Schoen
Class of 2001
Barb Wolf
Class of 1983
John Osterman
Class of 1960
Larissa Moldenhauer
Class of 2008
