The phrase 'acumen in' is not correct or usable in written English.
The correct and usable phrase is 'acumen in (something)'. For example, He has a remarkable acumen in mathematics.
He displayed great acumen in conciliating the Romans and Jews.
What makes Doerr so successful, Andreessen said, is his acumen in attracting "superstar" engineers and executives.
In a man that would be called "business acumen"; in Katie it was called "being manipulative".
He did not lose any of his offensive acumen in the interim.
But it also speaks to the lack of intellectual acumen in that talent pool.
Analysts say he showed boldness, but also financial acumen, in Brazil's economic crisis.
He revealed his business acumen in another bestseller, How to Get Rich (2006).
His acumen in all branches of the common law was readily spotted.
Once free, he displayed his sharp intellect and political acumen in his role as protector of the Protestant churches.
Conversely, complimenting someone on their business acumen in front of their colleagues is an easy way to win brownie points.
Their bosses and handlers emphasize their personalities as much as their acumen in an effort to carve out niche followings.
