Opened in 1968 by Gary Kellgren and Chris Stone.
The next year, Kellgren and Stone opened a second studio in Los Angeles. In 1972, the company expanded again with a third location in Sausalito, California. Kellgren died in 1977, and in the 1980s, the New York and Sausalito studios ended up under different ownership and management. The New York studio closed in 1987 and the Sausalito studio closed in 2008. The Los Angeles studio continues in business as “The Record Plant“.
In 1987, the New York studio was sold to Sir George Martin and closed soon afterward.
– sourced from wikipedia