The phrase "a great expert" is correct and usable in written English.
It can be used to describe someone who has extensive knowledge or skill in a particular field or subject.
Example: "Dr. Smith is a great expert in renewable energy technologies, and his insights are invaluable to our research."
Alternatives: "a highly skilled expert" or "an esteemed expert".
"I appreciate him but I'm certainly not a great expert.
"I am passionate about music, though not a great expert in music," he said.
"He works in a profession in which he is a great expert, in technology, and he works on issues related to this.
"But you are an archaeologist, a scholar and a great expert, and you had the knowledge to recognize objects that could have come from Etruria".
"At the time, the Lib Dem party did not have anyone who was a great expert on health," Williams recalled, describing her intervention.
Lord Lawson began his preview in last week's Radio Times: "Sir David Attenborough is one of our finest journalists and a great expert on animal life.
REBECCA MEAD: It would take a greater expert than me to answer this one, but I can certainly say from personal experience of both systems that the knowledge of how much a class is costing — and how high that price is — makes a dramatic difference to the way in which one metabolizes it intellectually.
Among hospitals that provide ongoing care to mechanically ventilated patients, a greater hospital volume and membership in a hospital network were both independently associated with a greater expert-validated order set quality score.
"He is a very great expert". I did, and the distinguished old man hauled out books and maps to the porch where we sat, delighted to have a student again.
The reliability of the results depends on the accurateness of the analyzed datasets and on the estimation of the parameters and their weights which rely to a great extent on expert judgment.
"He was a scholar of literature and a great Hemingway expert.
