The phrase "a former expert" is correct and usable in written English.
It can be used to describe someone who used to be an expert in a particular field but is no longer in that position.
Example: "After years of working in the industry, she is now a former expert in environmental science, having shifted her focus to education."
Alternatives: "an ex-expert" or "a past expert".
As a former expert on getting knocked around, I should know.
A Dan Flavin light piece from 1968, estimated at $200,000 to $300,000, was sold to Hughes Joffé, a former expert at Christie's, for $255,500.
Wayne White, of Washington's Middle East Institute and a former expert adviser to the Iraq Study Group, said it was unclear, given the diversity within the Sunni Arab insurgency, what influence the new grouping would have on the ground.
David Albright, president of the Institute for Science and International Security in Washington and a former expert for the atomic energy agency who has worked in Iraq, said today that that he was "a little surprised" that this Iraqi action had happened so quickly.
He added: "A great gap has opened up between Sunni and Shia under the occupation and al-Qaida has contributed to that". Wayne White, of Washington's Middle East Institute and a former expert adviser to the Iraq Study Group, said it was unclear, given the diversity within the Sunni Arab insurgency, what influence the new grouping would have on the ground.
As an inventor or co-inventor on about 70 design patents, and a former expert witness in seven other trials, he is nothing short of an expert.
Pilot tests of ThinThread proved almost too successful, according to a former intelligence expert who analyzed it.
"Musharraf is obviously a poison pill," said Daniel Markey, a former South Asia expert at the State Department under President Bush.
A novel by a former encryption expert is among this year's winners of the Mao Dun Literature Awards.
The tiny painting was authenticated, and its value thereby boosted into the stratosphere, by a former National Gallery expert, Nicholas Penny.
Ray Takeyh, a former State Department expert on Iran who is a senior fellow at the Council on Foreign Relations, underscored the obstacles to a quick breakthrough.
