"most expertise" is correct and usable in written English.
It is often used to describe something that is very skilled or knowledgeable. Here is an example sentence: "He has the most expertise in computer programming of anyone on staff."
Ultimately, Mr. Witzel said, "the person with the most expertise" in various matters under dispute was deferred to.
When he ventures away from topics where he has the most expertise — the Middle East, globalization, energy — he is content to be seen as inexpert.
"Sometimes those who work in industry have the most expertise on topic, so these candidates may score well," Ms. Kren wrote, explaining the process a selection committee uses.
The office, the agency with the most expertise in addressing the needs of the mentally ill, has little role in overseeing the adult homes, which shelter three times more mentally ill people than the psychiatric hospitals.
If you have several SBA centers in your area, find out which counselors have the most expertise and contacts in your particular industry.
You probably have the most expertise of anyone in your specific business or market, so don't be afraid to share that with the world.
Licensed barbers can cut anyone's hair, but most develop expertise in a particular type.
Yet most underwriting expertise remains within the banks, notes John Fitzpatrick of the Geneva Association, an insurance-industry think-tank.
When it comes to selling drugs, "the U.S. has the most marketing expertise," explains Hajime Shimizu, head of Eisai's American operation.
25 26 Specifically, one option is to keep most commissioning expertise in-house (make), buying in additional short-term support from external providers ad hoc.
Applicants are required to demonstrate how the various projects contained within their proposals are fully integrated, encourage participation of investigators with the most appropriate expertise, and employ cutting-edge approaches.
