2003, Steve Kemper, Code Name Ginger: the Story Behind Segway and Dean Kamen's Quest to Invent a New World Chapter 2, His first outside hire wasn't an electronics whiz or a mechanical mastermind, but a young industrial designer, a creature hitherto unknown at DEKA.
A person responsible for the highest level of planning and execution of a major operation.
2007, Mark S. Hamm, Terrorism as Crime: from Oklahoma City to Al-Qaeda and Beyond Chapter 6, The first was with none other than Khalid Sheikh Mohammad (KSM), mastermind of the 9/11 attacks.
Verb
To act in the role of mastermind.
2007, Kevin Danaher et al., Building the Green Economy: Success Stories from the Grassroots, It would later be revealed that the corporation contributed over a quarter of a million dollars to the effort—a whopping 93 percent of the total coffer—and hired a team of media and political experts to mastermind it.