The phrase "as mastermind" is correct and usable in written English.
It can be used to describe someone who is the chief architect or planner behind a particular scheme or project.
Example: "The project was a success, largely due to her role as mastermind behind the innovative strategy."
Alternatives: "as the brains" or "as the architect".
McLaren as mastermind, as Mephistopheles: he plays the part well.
Most outsiders know Mr. Sharon best as mastermind of the Israeli invasion of Lebanon in 1982.
In early 2011, Maude was described by the Guardian's Polly Toynbee as "mastermind of the shrivelling state, axeman in chief".
The unveiling of Lynton Crosby as mastermind of the next Conservative election campaign was conveyed to the public in contrasting ways.
Until now, Senussi's most notorious exploit was as mastermind of the bombing of a French airliner over Niger in 1989 in which 170 people were killed.
Shanahan was a Belichick before Belichick, so renowned for his cleverness that he was known as "Mastermind" in Denver after his second Super Bowl title with Elway.
General Soe Win was seen as masterminding the attack, according to diplomats, rights groups and government critics.
The Bible repeatedly describes God as masterminding genocide ("thou shalt save alive nothing that breatheth" — Deuteronomy 20 16), and European-Americans saw nothing offensive about exterminating Native Americans.
"He has developed and inspired some of the finest talents in comedy, as well as masterminded one of our best known production companies.
"A Liberal campaigner in Chisholm has been credited as masterminding an anti-Labor smear campaign focused on the anti-bulling Safe Schools Coalition and marriage equality".
It is alleged that the protesters are paid-up "Soros-oids"; the financier George Soros and the Open Society Institute are seen as masterminds of the protests.
