John F. Conroy, P.E., 92, of Grand Rapids, Michigan passed away peacefully at home on Sunday, March 13, 2022. John was born February 24, 1930, in Carroll, Iowa to James and Leona (Downey) Conroy. As a child, he moved to St. Paul, Minnesota, where he graduated from Cretin Military Academy High School. He received his Mechanical Engineering degree from the University of Minnesota in 1951. He later received his Professional Engineer designation from the State of Michigan. John was a longtime employee of Lear Siegler Incorporated (Smith Aerospace), as a Mechanical Engineer and Marketing Specialist/Manager. He was greatly involved in the development and implementation of early global positioning systems and gyroscopes for the aeronautics and defense industry. He journeyed throughout and saw much of the world during his career. He was an avid pilot, flying instructor and longtime member and treasurer of the Mohawk Flying Club, based at the Gerald R. Ford International Airport. John enjoyed traveling, be it visiting relatives, cruises or world destinations. In his spare time, he loved spending hours with his family and beloved dog, Bailey, at his cottage in Northern Michigan. He married his high school sweetheart, Yvonne (Leonard). They celebrated their 70th wedding anniversary in June 2021. Surviving are Yvonne, his wife; their children, Diane (Bruce) Zeeuw, John (Sandy) Conroy, David (Becky) Conroy, Karen (David Russell) Conroy; son-in-law David Spencer; sisters-in-law Barbara Conroy and Karen McCrae; 10 grandchildren, and 3 great grandchildren; nieces and nephews. He was preceded in death by his parents, brother James (Barbara) Conroy, sister Rita (William) Finnerty and daughter Lynn Conroy-Spencer (David Spencer). A Mass of Christian Burial will be held Friday, March 18th, at 11 a.m. at St. Paul the Apostle Catholic Church, 2750 Burton Street, SE, Grand Rapids, MI 49546. Reverend Michael Goodwin as celebrant. There will be a visitation from 10 a.m. – 11 a.m. A private burial for family at Graceland Memorial Park & Mausoleum at 1 p.m. If you wish, please make a memorial contribution to a charity of your choosing.