be the brains behindbe the brains behind (something)
to be the person who plans and organizes something, especially something successful.
He was the brains behind many of the best movies ever made.
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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.