The expression "highly expert" is correct and usable in written English.
You can use it to emphasize someone's superior skills, particularly when talking about technical or professional expertise. For example, "The doctor was highly expert at performing the delicate surgery."
Its director, JJ Abrams, having cut his teeth successfully rebooting Star Trek, is a highly expert, professional superfan.
The answer is that these people are often highly expert at what they do, despite being poor at teamwork.
The brief biographies of the members of this highly expert committee are publicly available, and the final report is expected to be issued in late July.
Since these plants are technologically based, they tend to be staffed with people who are highly expert and up to date in that technology.
In an effort to carve out an identity for themselves, they often make themselves highly expert in a narrow field in which their parents have little authority and can't challenge them.
For example, after the flood of the Arno River in Florence in 1966, Italian conservators developed drastic but necessary and highly expert methods to transfer frescoes from decayed walls.
However, the techniques of landscape visualisation remain highly expert-oriented in spite of some recent moves to more directly involve users in aspects of scene preparation.
With highly biased experts, three experts appear to be sufficient for establishing content validity.
However, in the presence of highly biased experts, three experts will be adequate.
Strong effects from this deletion compared with the "all experts model" would indicate that the model is biased by highly polarised expert opinions.
It was always kept by a highly qualified expert of my own selection.
