Mac Tonegawa Obituary

With profound sadness, we say goodbye to Mac Tonegawa of River Vale, New Jersey, whose vibrant spirit touched the lives of many. Mac left this world on January 4, 2026 at the age of 59, leaving a void in the lives of so many people. You can send your sympathy in the guestbook provided and share it with the family.

As Mac departs from our midst, his spirit ascends to join the cosmic dance of stars, a shimmering constellation of memories that will forever grace the night sky of the hearts of those who loved Mac. Though Mac may no longer walk beside us, his legacy lives on — a testament to the enduring power of love to transcend the boundaries of time and space.

He was loved and cherished by many people including: his wife Sally Tonegawa; his children, Tetsu and Kasane Tonegawa; his daughter-in-law Caroline Monaghan; his brother Hisao (Yukio); his parents, Jo (Yoriko Tonegawa) and Mac; and his child NJ.

In lieu of flowers, Mac's family requests that you consider a donation in Mac's memory to Memorial Sloan Kettering's Pancreatic Cancer Research team.