The phrase "a unique expertise" is correct and usable in written English.
It can be used to describe a specialized skill or knowledge that is distinct and not commonly found in others.
Example: "Her unique expertise in renewable energy technologies makes her an invaluable asset to the team."
Alternatives: "a distinct skill set" or "a specialized knowledge".
Mr. Singer, a corporate lawyer, had a unique expertise in the law of foreign missions.
"Our focus has always been digital audio, with a unique expertise in innovative monetization solutions.
ConAgra went with iProcure precisely because of its status as an obscure player that has a unique expertise in a complex and important aspect of industrial procurement.
They have a unique expertise.
Certainly Hajj represents the largest mass gathering anywhere in the world and its legacy is an extraordinarily unique expertise in rapidly deployed massive public health responses.
Above all, the loss of a PI's unique expertise and strategic research vision leaves behind a scientific gap that's difficult to bridge.
Board development has become a task that demands unique expertise.
In a previous study concerning the implementation of the Housing First program in an American suburban county, Felton [ 6] found that this program was also described as a new practice having unique expertise, and this again met resistance from local authorities.
But several have pockets of unique expertise, or a wide variety of potentially useful medicinal plants.
"The WayRay team has unique expertise with a solid background in space engineering, hardware and software development," said Lutz Meschke, Deputy Chairman of the Executive Board and Member of the Executive Board for Finance and IT at Porsche, in a statement.
With unique expertise and a company spanning three continents, she counts among her clients Scholastic, Inc., Novartis, Novell Inc. and Sun Microsystems, in addition to a number of top tier software and media brands.
