Gabrielle Donnay (née Hamburger) died peacefully at her home, on the flanks of Mont St. Hilaire, on April 4th, 1987. Gai was born in Landeshut, Silesia (in Germany at the time, now part of Poland). Her father was a textile manufacturer, and her mother had a career in music. She early developed lasting interests in sports, the great outdoors, and the violin. Although she had passed the examination for admission to the University of Oxford, she chose to emigrate to the United States. At the age of 17, she disembarked alone in Quebec, ready for the adventures of a very different life on a new continent, and headed to Los Angeles, where she was expected by friends of the family. Four years later, she graduated from UCLA with highest honors in chemistry. She had already begun her lifelong interest in the structure of crystals, with her first paper entitled “The crystal structure of diphenylselenium dibromide.” There soon followed a second paper on the chlorine‐bearinga nalogue.O ne sensesr ight away that Gai was not a run‐of‐the‐mill undergraduate student! Martin J. Buerger also came to this conclusion and encouraged Gai to apply her considerable talents to meaty researcht opics in the world of minerals.For her Ph.D. thesis, she tackled and solved the awesome noncentrosymmetric rhombohedral structure of tourmaline, using photographic techniques and nothing fancier than a desktop electrical calculator! She graduated from the Massachusetts Institute of Technology in 1949.