John Christopher Mosack

John passed away unexpectantly on May 25, 2024. He was born in Duluth, MN to Donald and Maureen Mosack and was raised in Palatine, IL. John was dedicated and passionate about being an athlete, working out, and eating healthy. Growing up he played basketball, baseball, hockey, was a swimmer, and a cross country runner. No matter the sport, he loved the competition.

John met his wife, Kimberly Mosack, through his sister Rebecca Hahnfeld. They married in 2001 and he was a loving and supportive husband. They have three children, Donovan (born in 2002), Kailey (born in 2006), and Brooke (born in 2008). Donovan is currently attending Illinois State University and is pursuing a secondary physical education major following in his dad’s footsteps. Kailey graduated from Cary-Grove High School and will be attending the University of Iowa pursuing a marketing major. Brooke is a sophomore at Cary-Grove High School where she is a member of the dance team. John loved being a husband and dad and created a home full of fun and laughter. He thoroughly enjoyed going on beach vacations with the family.

Surviving parents are Donald and Maureen Mosack of Oakwood Hills, IL. Surviving family members include Steve (Lisa) Mosack with nephews Scott and Christopher Mosack, Terri Mosack, Rebecca (Jeffrey) Hahnfeld with nieces Eva, Ella, and Faye. Additional survivors include Uncle Michael Harrington, many cousins, in-laws Leroy and Beatrice Kunkel, brother-in- law Jeffrey (Kim) Kunkel with niece Carissa Kunkel, sister-in-law Tammy Daugherty (Tom), with nephews Tommy, Todd, Tanner, Tyler, and niece Tierney.

John was an unforgettable teacher at Fremd High School in Palatine for 35 years. In his later years of teaching, he introduced himself as “Captain” to his classes. He was a motivating and inspirational coach at Fremd High School for boys’ basketball (15 years), girls’ softball (13 years), girls’ volleyball (10 years).

Upon ending his high school coaching career, he relished being involved in his own children’s activities. He enjoyed being a coach for Donovan’s basketball teams. He was always present and supportive of his children at their basketball games, baseball games, dance competitions and recitals, and soccer games.

John was diligent in taking care of his health with daily workouts and healthy eating habits. He loved life and lived each day to its fullest. His crazy and funny stories will forever make us laugh and will be grievously missed by all who had the privilege of knowing him. He was strong in his faith and lived by the motto of living life to the fullest because you never know if the next day will be your last. His year of retirement was filled with daily workouts, walks at the marina, visits to the church, and spending time with family.

John loved and adored his kids so much and was passionate about education. His wish was for his children to achieve a college education in pursuit of their dream career. In lieu of flowers, donations can be made directly to the children by their names for the purpose of furthering their education.

Visitation is planned at Saints Peter and Paul Catholic Church in Cary, IL on Saturday, June 8, from 9am - 11am with a mass immediately following at 11am. Interment will be held privately. It would be wonderful if the church could be filled in his honor.