John J. Zimmerman, a Rowayton resident for over 50 years, died Tuesday, March 8, at 84 years of age. He was born and raised by his parents Joseph and Marie née Schmidt Zimmerman in New York City.
John served two years in the 773rd Antiaircraft Artillery Battalion, New York National Guard, during the Korean War. With an engineering degree from New York University, John had a long and successful career at Columbia University’s Engineering Research Laboratories, Heat Transfer Research Facility that spanned 42 years. He was a hard worker and was passionate about his field. The Heat Transfer Research Facility tested nuclear reactor fuel rods and documented the water cooling heat transfer characteristics of nuclear fuel rod bundles. Their troubleshooting of the equipment was instrumental in establishing how power plants operate safely. Many U.S. nuclear reactors and power plants are run based on the measurements made in the facility. This was the only lab of its kind in the U.S. and has since closed.