Steven A. Tonsfeldt, of Remsen, Iowa, left this life on July 19, 2026, completing a journey that began with wonder, grew through knowledge, and radiated through every life he touched.

Memorial services for Steve will be held at 11:00 a.m. on Saturday, July 25, 2026 at the Boothby Funeral Home in Cherokee, Iowa, located at 207 E. Main Street. Visitation with the family present will be held an hour prior to services beginning at 10:00 a.m. on Saturday at the funeral home. Pastor Tom Smith will officiate. Private family burial will be held at the Remsen Cemetery. The Boothby Funeral Home of Cherokee and Marcus is assisting the family with arrangements.

In lieu of flowers, memorial contributions may be made in his honor to Wet Nose Rescue or The Nature Conservancy in Iowa—two organizations that deeply reflect his values and passions.

Born to Clifford and LaVonne (Haack) Tonsfeldt on May 26, 1950, Steve was shaped by kindness — sweet, caring, funny, and brilliant in that unmistakable way that sometimes made him too smart for his own good. His curiosity was boundless. His love for science and physics was more than merely academic. The space program thrilled him, astronomy captivated him, and the night sky felt like an old friend. It’s fitting, then, that he has returned to the very dust from which stars — and extraordinary souls — are made.

After graduating from Remsen Union, Steve attended the University of Iowa, and ultimately earned his doctorate in physics from the University of North Carolina, a milestone that reflected both his intellect and his deep fascination with the workings of the universe. Yet after all that learning, he chose to come home to the family farm and the soil that grounded him. He returned not only to the land but to his parents, whose quiet strength and steady presence had shaped his life. Working beside his father and uncle, Murl, he found joy in the rhythm of the seasons, the satisfaction of honest labor, and the enduring bond of family. Beneath the rhythms of day-to-day life ran a deep current of respect and commitment to his family.

He taught physics and a variety of other science courses first at Westmar College, then at Buena Vista University, where he inspired generations of students until his retirement in May 2009. He shared his excitement for science with students, clubs, community groups, and anyone lucky enough to cross his path. He did his best to make the complex feel simple, the abstract feel wondrous, and the world feel bigger.

Steve’s devotion to the natural world was just as profound. He loved gardening, tending plants with patience, joy, and occasional frustration. And the trees — so many trees — each one planted with hope and a quiet belief in the future. He served as a Plymouth County Soil and Water District Commissioner for 30 years, protecting the land with the same care he gave to his own gardens and fields. He volunteered with the Sanford Museum Association, nurturing curiosity in others just as he had nurtured it in himself.

He adored animals, especially cats, who always seemed to sense his gentle spirit. He loved to travel, collecting memories and stories that delighted him. And above all, he was deeply proud of his children and grandchildren. Their achievements brought him great pride, and their happiness was his own.

To Amy, his wife, he was a steadfast cheerleader — the one who believed in her dreams, her strength, her vision. Their partnership was built on patience, humor, shared curiosity, and the quiet comfort of knowing they were each other’s home.

He leaves behind daughter Jenny (Lars) Robins, son Erik (Lindsey) Tonsfeldt, daughter Anna (Nick) Zak, and stepson Steven Johnson, grandchildren Emma and Owen Robins and Aaron and Alena Tonsfeldt, brothers Denis (Michele Cramer) and David (Lori), nieces, nephews, cousins, fur babies, and friends who will carry his memory not as an absence, but as a presence — steady, luminous, and enduring.

His life was a constellation of kindness, intellect, curiosity, and love. And though he has returned to stardust, the light he cast remains.

Steve was quietly charitable and deeply humble, never one to seek attention or praise. His generosity showed in small, steady ways — through kindness, service, and care for the world around him.