the person who provides ideas and plans for an activity.
Someone very clever must be the brains behind such an organized group of thieves.
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the brains behind (something)
The person responsible for a certain plan or idea. Sheila is the brains behind our new environmental initiative, so she deserves all the credit.I wonder which of my enemies is the brains behind this latest rumor about me.
the ˈbrains behind something
the person who thinks of new ideas and makes plans for somebody/something: Everyone knew that she was the real brains behind the operation.