The phrase "a major expert" is correct and usable in written English.
It can be used to describe someone who has significant knowledge or expertise in a particular field or subject.
Example: "Dr. Smith is a major expert in renewable energy technologies, frequently consulted by governments and organizations worldwide."
Alternatives: "a leading expert" or "a prominent expert".
Among his colleagues, though, he is known, above all, as a major lateness expert.
Professor Mark Braverman described Weinberg as "a major young expert in the exciting field of algorithmic mechanism design," the development of algorithms that work in situations where the participants are driven by incentives that are not only distinct but often obscure.
PJM is the SOTI coordinator and as a major clinical expert in the SOTI study, also validated the clinical aspects of the article.
CR was responsible for the assessments of vertebral fractures in the SOTI study (semi-quantitative and quantitative) and as a major clinical expert in the SOTI study, also validated the clinical aspects of the article.
SP, was the major expert in laboratory analysis of biomarkers in alternative matrices and contributed in writing the manuscript.
The failure of patients to take their drugs faithfully is a major problem, experts say, because it allows H.I.V. to develop resistance to the drugs.
Although much of that decline can be attributed to a recession, changes in behavior also played a major role, experts say, noting that the country's emissions dropped 6.7 percent in 2011 even as the economy grew slightly.
But when the infamous Kandahar run isn't closed for a major race, experts can pause for incredible views before charging the black trail nearly 3,000 vertical feet to the valley.
If more judges were to name names of prosecutors believed to have engaged in misconduct, it could have a major effect, experts say.
A major issue, experts say, is a lack of a robust monitoring system to keep track of whether products that say they're organic really are.
