Robert H. Janssen Obituary

With heavy hearts, we announce the death of Robert H. Janssen in Milwaukee, Wisconsin, born in Oshkosh, Wisconsin, who passed away on February 17, 2026 at the age of 97. Leave a sympathy message to the family on the memorial page of Robert H. Janssen to pay them a last tribute.

He was predeceased by: his parents, Harry Janssen and Virginia Janssen; his sisters, Jean, June, Janie and Patsy; and his daughter Mary Jo Olschesky (Janssen).

He is survived by: his wife Katherine J. Stadtmueller; his children, Anne Janssen Gavigan (Tim), Jean Janssen Ristow (Gary) and Robert J. Janssen (Lorie); his son-in-law Jim Olschesky; his grandchildren, Jennifer Olschesky (Justin), Amy Olschesky Kolpin (Kent), Kristin Ristow Schell (Josh), Zachary Janssen, Joshua Janssen, Elizabeth Gavigan Stapleton and Kelly Gavigan Swanson; his great grandchildren, Owen and Luke Kolpin; and his brother-in-law Franz Stadtmueller.