John Donald Laessig Obituary
The world bids farewell to John Donald Laessig of Newtown Square, Pennsylvania, departing on May 13, 2026 at the age of 94. John leaves behind memories cherished by the community. Leave a sympathy message to the family in the guestbook on this memorial page of John Donald Laessig to show support.
He was predeceased by: his parents, Henry B. Laessig and Ann Laessig (Koll); and his brother Henry Laessig (Marie). He is survived by: his wife Patricia Ann Laessig (Pierce); his children, Diane Laessig (Mark Green), Donna Donato (Greg), John Laessig, Jr. (Brenda) and Susan Laessig (Sung Han); and his grandchildren, Jennifer Donato (Tristan Rozea), Bryan Donato, Julia Laessig, John Laessig III, Lianna Han and Kyle Han.
He was especially proud of his contributions to the development of the first Sidewinder missile.
