John J. Klauser, 89, of Hamilton, passed away at home Sunday, September 18th surrounded by family. John was born in Trenton to John (Johann) and Regina Klauser. John was a tool and die maker at J.L. Roebling for 21 years. He was a Master Instrument Maker in the Jadwin Physics Laboratory at Princeton University until 1969 when he transitioned to the Forrestal Research Center of Princeton University, working with their cyclotron fusion project. He retired in 1986 from R.C.A. David Sarnoff Research Center in Princeton, where he worked on the development of the flat panel T.V. John was a member of Our Lady of Sorrows-St. Anthony Parish in Mercerville; a member of the winning target pistol team at J.L Roebling. He was the president of the Trenton Chapter of the Cast and Aim Sports Club; he also was a member of the Hamilton Elks and the Donausschwaben German American Club in Yardville, NJ. John enjoyed fishing and spending time at the Jersey shore. He is survived by his wife Mae of 66 years and four children, Kathleen Alexander of Hamilton, JoAnn York and her husband Philip of Cape Coral, FL, John Jr., his former wife Laura of Summit Hill, PA, Mary Beth Dunbar and her husband Philip of Burlington, NJ; two sisters, Regina Popovec of Buffalo, NY and Annamarie Capone and her husband Nicholas of Hamilton Square; seven grandchildren; Eric Anderson; Heather Alexander and her husband John Brechtel; Natasha Kessler and her husband Lou; John Kurt Klauser; Philip Andrew and Olivia Dunbar, and Christian Klauser; two great-grandchildren, Kendra and Taylor Kessler; several nieces and nephews, Nicholas Capone and his wife Lucy of Bel Air, FL, Deborah Capone Swearer of Newtown, PA, Thomas Popovec of Grand Island, NY, Joseph Popovec and his wife Linda of Texas, Steven Popovec of Denver CO, and Jeanie Olkowski and her husband Brian of Amherst, NY; as well as several grand nieces and nephews. Family and friends may call 6-9 pm Friday, September 23rd at Saul Colonial Home at 3795 Nottingham Way, Hamilton Square. Mass of Christian Burial will be celebrated 11 am Saturday, September 24th at Our Lady of Sorrows Church, 3816, East State Street Extension, Mercerville, NJ. Interment will follow at St. Mary's Cemetery, Trenton, NJ.