be the brains behind (something)

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be the brains behind (something)

To be the person responsible for a certain plan or idea. Sheila is the brains behind our new environmental initiative, so she deserves all the credit. The cops finally made an arrest, but it was just a low-level guy. They're still looking for the person who is the brains behind the scam.
See also: behind, brain
References in periodicals archive ?
Meanwhile, al-Zawahri, thought to be the brains behind 9/11, claims al-Quaeda have bought nuclear weapons.