Otego, New York - OTEGO - John Michael Ahearn, 78, passed away peacefully on June 18, 2026. Born in Baltimore, Maryland, John earned a bachelor's degree in biology from Delaware Valley College of Science and Agriculture in 1970. He worked for many years as a microbiologist at Schering-Plough in Union, New Jersey, before moving to upstate New York in 1985 to continue his career with Corning Inc. He maintained a lifelong interest in science and the natural world, sharing that enthusiasm with his family.

John was predeceased by his parents, Edward and Florence (nee Michael) Ahearn. He is survived by his loving wife, Judith Ahearn; daughter, Erin (Steve) Waring; son, Brian (Kimberly) Ahearn; son, Ted (Angelica) Ahearn; sisters, Holly (Debbie) Ahearn; Nancy (Eli) Almaleh; Karen (Rich) Pearlman and Sharon (Jim) Siedliski. He is also survived by grandchildren, Nola Waring, Henry and Courtney Ahearn and Elijah Ahearn as well as numerous nieces and nephews. John will be remembered for his curiosity, knowledge, and love for his family. He will be greatly missed.

A Funeral Mass will be offered at 10 a.m., Monday, June 29, at St. Mary's Church, 39 Walnut Street, Oneonta. Burial will be in Mt. Calvary Cemetery. Online condolences may be made at: www.wmaddenfh.com.