"Gary Wayne Kellgren"@en . "Gary Kellgren"@en . . . "1939Z"^^ . . "American audio engineer" . "non_performing_personnel" . . "1977Z"^^ . "Kellgren, Gary"@en . . "1967Z"^^ . . . "1939-04-07Z"^^ . "1977Z"^^ . "Gary Kellgren (April 7, 1939 - July 20, 1977) was an American audio engineer and co-founder of The Record Plant recording studios, along with businessman Chris Stone."@en . "1977-07-20Z"^^ .