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Fr. John "Jack" H. Kleinhenz, SJ
Fr. Kleinhenz was an excellent math teacher and, after finishing his formal teaching career, continued tutoring students.
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Fr. John "Jack" H. Kleinhenz, SJ

Let us pray in thanksgiving for the life of Fr. John "Jack" H. Kleinhenz, SJ, who died on Thursday, November 22, 2018, at Colombiere Center in Clarkston, Mich. He was 97 years old and the oldest member of the USA Midwest Province. May he rest in peace. 

Fr. Kleinhenz was born on July 16, 1921, in Cleveland. He entered the Society of Jesus on September 1, 1939, at Milford Novitiate in Milford, Ohio. He was ordained on June 18, 1952, at West Baden College in West Baden Springs, Ind. He took final vows on February 2, 1957, in Detroit. Fr. Kleinhenz graduated St. Ignatius High School in Cleveland before he entered the Society. 

While in the Society, he earned a bachelor's degree in Latin from Xavier University (1942). He earned a licentiate degree in philosophy (1946) and sacred theology (1953) from West Baden College in West Baden, Ind. Fr. Kleinhenz also earned a master's degree in math from the University of Detroit (1966). During regency Fr. Kleinhenz taught math, Latin, and theology at St. Xavier High School in Cincinnati. After completing his initial studies, he cared for members of the Society as socius to the master of novices (1954-1956), secretary to the Detroit provincial (1956-1957), and socius to the brothers' master of novices (1957). 

Fr. Kleinhenz then began his 50 years of working in secondary education. He was the assistant principal of St. Ignatius in Cleveland (1957-1960), taught math and theology at the University of Detroit Jesuit High School (1960-1962), and taught math (and was minister of the Jesuit community) at Brebeuf Jesuit Preparatory School (1962-1963). After spending a year (1963-1964) completing his master's degree, he returned to St. Ignatius, Cleveland where he spent 13 years teaching math (1964-1977). Fr. Kleinhenz taught for a year at Regis High School in New York, before returning to his alma mater where he spent the next 30 years teaching and tutoring math (1978-2008). He was a Detroit province consultor from 1995-2001. When Fr. Kleinhenz moved to Colombiere Center in 2008 to care for his health, he had spent a total of 46 years working at St. Ignatius High School in Cleveland. 

Fr. Kleinhenz was an excellent math teacher and, after finishing his formal teaching career, continued tutoring students. His various apostolic assignments showed that he was a most available Jesuit. He seemed to know everyone in his hometown of Cleveland—especially the diocesan clergy—and attended many wakes and funerals of friends and St. Ignatius alumni. In his later years, he would celebrate the morning Mass in the student chapel at St. Ignatius High School every day. Through to the end of his life, he continued to regularly send short notes to people informing them that he was thinking of and praying for them. 


Sunday, November 25, 2018
3:00 - 7:00 p.m.
Wake Service
7:00 p.m.
Colombiere Center
9075 Big Lake Road Clarkston, MI 48346

Funeral Mass

Monday, November 26, 2018
10:45 a.m.
Colombiere Center
9075 Big Lake Road
Clarkston, MI 48346

Burial Service

Immediately following the funeral

In Memoriam

Jesuits Summer 2019

Jesuits Spring 2019

Jesuits Fall/Winter 2018

November 27, 20189:05 AM
A wonderful man -- for me, truly the heart of St. Ignatius High School. I look back now in surprise at how young a man he was when our class knew him. A firm disciplinarian, but never mean spirited and always supportive. – Neil Story '61

November 27, 20185:19 PM
Jack taught me freshman theology at St. Xavier High in 1951. He always asked about my parents during my early years in the Society. My last visit with him was at Colombiere at the time of Harry's death in December 2015. Rest in peace, Faithful Servant! – Carl Meirose

November 28, 20189:09 PM
Father was a dear friend of my Dad, Bob McGrail. I remember fondly our trips to ND Football games with my brothers, Bob and Tim. He and my Dad were great examples of loyalty and respect. – Sharon Goggin

December 03, 201811:55 AM
I had the fearsome privilege of having Fr. Kleinhenz for Calculus my senior year, 1964-65. By some fluke I ended up in the AP Brainiac class with guys who went on to Stanford, Cambridge, NASA, and probably to Stockholm to pick up a Nobel Prize or or two. Fr. Kleinhenz did his best with me and even gave me some additional tutoring despite his packed schedule. By some miracle I got through and I know some of my final grade was a gift. I've been grateful ever since and had the good fortune of seeing him a while back and thanking him again. I hope we meet again in Heaven where I'm sure he is differentiating equations at lightning speed. A truly great and holy man. – Leo Zupan

December 07, 20186:28 PM
I love you cousin Fr.Jack. May God bless you abundantly in heaven. – Keith Kleinhenz

Demontreville Jesuit Retreat House
The Demontreville Jesuit Retreat House is located on the shores of Lake De Montreville in Lake Elmo, Minn.