Gary Kellgren (1937-2003) was an influential American audio engineer and producer, renowned for his work in the rock and pop music genres during the 1960s and 1970s. He is best known for his innovative engineering techniques and contributions to landmark albums, particularly with the legendary band The Doors. Kellgren worked on their albums "Strange Days" and "L.A. Woman," where his expertise in using reverb and echo helped shape their unique sound. Kellgren also collaborated with other notable artists, including Frank Zappa and the band The Mothers of Invention, contributing to albums like "We're Only in It for the Money." His work is characterized by a blend of creativity and technical prowess, which significantly influenced the recording industry. Beyond his engineering skills, Kellgren was a pioneer in studio design, playing a key role in the establishment of the Record Plant studio in New York City, which became a hub for many prominent musicians. His impact on music lies in his ability to capture the essence of artists' visions, making him a respected figure in the evolution of sound recording. Kellgren's legacy continues to be felt, as his techniques still resonate in modern recording practices.