Tony W. Keller (1937–2023).

Tony Keller, a pioneer in the field of Nuclear Magnetic Resonance (NMR) spectroscopy, passed away on October 27, 2023, at the age of 86 in Spiez, Switzerland. His work and vision were essential to the development and commercialization of NMR spectrometers for many areas of scientific research. Keller's contributions include the development of the world's first multinuclear, Fourier transform NMR spectrometer and the introduction of proton‐broadband decoupling in Fourier‐transform mode, which revolutionized heteronuclear NMR spectroscopy. He also played a significant role in the advancement of NMR technology, including the creation of superconducting magnets, digital spectrometers, cryogenically cooled probes, and high‐field NMR spectrometers. Keller's legacy will continue to inspire future generations of scientists. [Extracted from the article]