John “Jack” McKeeth Sowle

Sowle

John “Jack” McKeeth Sowle, a mechanical engineer whose early career contributed to the life support systems that kept America’s first astronauts alive, and who spent the decades that followed building a life defined by family, curiosity, and an unshakeable belief in the value of education, died peacefully on April 3, 2026, in Austin, Texas. He was 94.

Born on March 13, 1932, in Sparta, Wisconsin, Mr. Sowle was the only child of Rose McKeeth Sowle and Edward H. Sowle, a Milwaukee Railroad employee whose work eventually brought the family to Chicago. It was there, in the city’s public schools, that Jack received what his family described as a remarkable education — one sharpened further by summers on his grandparents’ farm in Wisconsin, where a work ethic and a love of the land took root early.

He attended the Missouri School of Mines before transferring to Purdue University, where he ran track, pledged Kappa Sigma, and earned a degree in mechanical engineering. He also found something else at Purdue: Melissa Alice Wardell, the woman he would marry on July 25, 1953, and with whom he would build a family across five decades and as many states.

After graduation, Mr. Sowle joined the United States Air Force and was stationed in Dayton, Ohio. The assignment placed him at the edge of history. Working during the earliest years of the American space program, he contributed to the development of the life support system designed to sustain the first U.S. astronauts — men whose survival in the void of space depended, in part, on engineers like him. He pursued his MBA at Ohio State University while in uniform, a characteristically practical decision from a man who never stopped learning.

He went on to a long career with Shell Chemical, rising through the ranks to join the company’s management team before retiring after years of service that took the Sowle family across the country. Wherever they landed, Jack and Melissa made a home — hosting parties, planting gardens, and filling the house with children, noise, and baseball.

Mr. Sowle was an ardent sports fan. He rooted for the Purdue Boilermakers and the Houston Astros, and he carried fond memories of watching the Chicago Cubs play at Wrigley Field as a boy. He coached his sons’ teams and attended his sons’ and daughters’ events. Education carried the same weight in the Sowle household: his children, by their own account, simply never understood that not going to college was a choice available to them.

After Melissa’s death in 2008, Mr. Sowle married Patti Walker Sowle. Her death less than a year later was a loss the family felt deeply. In his later years, he found joy and companionship in his close friendship with Sue Doughtie.

He spent his final chapter between Seneca Lake, Ohio, and Horseshoe Bay, Texas — golfing, gardening, and presiding over a grandchildren’s world populated with pontoon boat rides, composting lessons, Gator driving instruction, peanut fights, and a mysterious “Tickle Book” whose contents have apparently never been fully disclosed to outsiders. He taught his grandchildren to garden, to tend a fire safely, to listen carefully, and to laugh freely. He sang to his children — “Try to Remember” and “You Are My Sunshine” — and they can still sing them today.

Those who knew Mr. Sowle — colleagues, neighbors, his caregivers — remember a man of genuine warmth who had a gift for making people feel seen. The lives he touched extended well beyond his own family.

Mr. Sowle is survived by his children, Mark (Lesley) Sowle, Daniel (Diane) Sowle, Sandy (Marvin) Waley, and Shelly (Russ) Horton; eight grandchildren, Samantha (Jordan) Watts, Danielle (Christopher) Hopkins, Erica (Jason) Riley, AJ (Tiffany) Horton, Sally (Demian) Waley, Audrey (Johnny) Jisha, Travis (Vicky) Sowle, and Lindsey (Austin) Drake; ten great-grandchildren, Adilyn, Carter, Oliver, Jack-Jack, Aiden, Jules, Forest, Elianna, Benjamin, and Delilah; an eleventh great-grandchild expected this summer; and his longtime companion and dear friend, Sue Doughtie.

A private celebration of his life will be held at a later date.