Moog synthesizer - Wikipedia

On August 21, 2005, Robert Moog, American engineer who designed the Moog synthesizer and Moog Music died of a brain tumor at the age of 71.
From the article:

"Moog synthesizer (pronounced /moʊɡ/ MOHG; often anglicized to /muːɡ/ MOOG, though Robert Moog preferred the former)[2] may refer to any number of analog synthesizers designed by Robert Moog or manufactured by Moog Music, and is commonly used as a generic term for older-generation analog music synthesizers. The Moog company pioneered the commercial manufacture of modular voltage-controlled analog synthesizer systems in the mid 1960s. The technological development that led to the creation of the Moog synthesizer was the invention of the transistor, which enabled researchers like Moog to build electronic music systems that were considerably smaller, cheaper and far more reliable than earlier vacuum tube-based systems.

The Moog synthesizer gained wider attention in the music industry after it was demonstrated at the Monterey International Pop Festival in 1967. The commercial breakthrough of a Moog recording was made by Wendy Carlos in the 1968 record Switched-On Bach, which became one of the highest-selling classical music recordings of its era.[3] The success of Switched-On Bach sparked a slew of other synthesizer records in the late 1960s to mid-1970s.

Later Moog modular systems featured various improvements, such as a scaled-down, simplified, self-contained musical instrument designed for use in live performance."