be the person who organizes sth, esp. sth successful
The Prosecution had long claimed that Federmanwas the "brains" behind the Bat Ayin plot. Google
Bob McTavish was the brains behind the shortboard revolutioncoming out of Australia in the late 60s. Google
There, he was the brains behind the building of the Colossus code-breakingcomputer which was used to decipher enemy messages. Google
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