MARINA GUILLEN/EPA-EFE/REX/Shutt

Other than George Martin, he was the behind-the-scenes brains that helped shape the band's sound — particularly, the weird ones.

Geoff Emerick, the Beatles chief recording engineer who worked on some of the band’s most seminal albums, has died according to his manager William Zabaleta. He was 72 and believed to have suffered a heart attack.

Said Zabaleta in a statement to Variety: “Today at around 2’o’clock, I was making my way back from Arizona to Los Angeles to pick up Geoff so we could transport some gold records and platinum plaques to our show in Tucson. While on the phone, he had complications and dropped the phone. I called 911, but by the time they got there, it was too late. Geoff suffered from heart problems for a long time and had a pacemaker. … When it’s your time it’s your time. We lost a legend and a best friend to me and a mentor.”

Emerick, born Dec. 5, 1945, began working as an assistant engineer at Abbey Road at just 15 years-old and, just a few months months in, was face-to-face with John Lennon, Paul McCartney, George Harrison and Ringo Starr in the London studio. He apprenticed and later worked on such early Beatles’ recordings as “Love Me Do”, “I Want To Hold Your Hand,” “She Loves You,” and “A Hard Day’s Night.” Later becoming the band’s chief engineer, he helmed “Revolver,” “Sgt. Pepper’s Lonely Hearts Club Band,” “The White Album” and “Abbey Road” as well as the dual-sided single “Penny Lane”/”Strawberry Fields Forever.”

Other than George Martin, Emerick was the behind-the-scenes brains that helped shape the Beatles sound. When John Lennon asked Emerick to make him sound like “the Dalai Lama singing on a mountain” for “Tomorrow Never Knows” on “Revolver,” one of the effects Emerick used was to put Lennon’s voice through a spinning Leslie speaker. As Andy Babiuk describes in the book “Beatles Gear,” Emerick’s “open-minded approach and willingness to ignore standard recording practices and techniques when necessary was exactly what the group was looking for.”

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Speaking to Variety in July 2017, Emerick cited “A Day in the Life” as a high point of his time with the Beatles. “The night we put the orchestra on it, the whole world went from black and white to color,” he said.

Emerick was a Grammy Award winner for his work on “Sgt. Pepper’s” and “Abbey Road” as well as Paul McCartney and Wings’ “Band on the Run.” He is credited on albums by Elvis Costello (“Imperial Bedroom”), Badfinger, Supertramp, Cheap Trick and America, among many others. In 2006, he released the book “Here, There and Everywhere: My Life Recording the Music of the Beatles.”

Emerick had many upcoming appearances scheduled, including one on Saturday in Tuscon under the banner Geoff Emerick’s London Revival, where he was due to talk about his work with the Beatles. He was also to be one of several Beatles experts at The White Album International Symposium scheduled for Nov. 8 to 11 at Monmouth University in New Jersey to honor the 50th anniversary of the release of “The White Album,” which is being reissued as a box set with outtakes and a new 2018 mix.

Denny Laine, who was a member of Paul McCartney and Wings, tweeted upon hearing the news: “Geoff was a brilliant engineer and a fine man.”

Pictured below: Brian Epstein, George Martin and Geoff Emerick in 1967.