James Stillman Rockefeller Jr., (1926-2025), died at his home of seven decades on January 8, 2025, the day after his 99th birthday. Jim was born in the Manhattan apartment of his parents, Nancy Carnegie Rockefeller and James Stillman Rockefeller Sr., and raised in Greenwich, Connecticut. He was the grandson of William G. Rockefeller; great-grandson of James Stillman; and great-grandnephew of both John D. Rockefeller and Andrew Carnegie. He was predeceased by his brother, Andrew Carnegie Rockefeller; and sister, Georgia Rockefeller Rose. Jim attended Greenwich Country Day School and Deerfield Academy, then served in the Army Air Corps during World War II. After graduating from Yale University, where he studied English and history, he spent several years traveling and exploring before finally settling down in Camden, Maine. In 1974 he cofounded the Owls Head Transportation Museum (the largest working transportation museum in New England) along with Tom Watson Jr. and Steve Lang, and served as its chairman until 2017. For more than twenty years, at Bald Mountain Boat Works, He met Stella, the mother of his first child, James Bennet ("Wawa"), during his travels to Tahiti. Both Stella and "Wawa" have since deceased. He married Liv Heyerdahl in 1956 in Norway, where their two children, Liv Merlin and Ola Stillman Rockefeller, were born. Liv Heyerdahl died when the children were still young. Jim was also predeceased by his two stepsons, Bjorn and Thor Heyerdahl Jr., children of Liv and the Kon-Tiki explorer, Thor Heyerdahl. Since 1983, Jim had been deeply in love with Marilyn Moss, the writer and former CEO of Moss Inc. They were happily married for more than 41 years. Jim is survived by his wife, Marilyn; younger sister, Nancy McFadden Copp; his children, Liv and Ola; his stepchildren, Genevieve and Jeffrey; his grandchildren, great-grandchildren, nieces, nephews, and many other family members.