He is generally recognized to be the foremost American authority on that subject.

At the time of the competition, he was considered to be the foremost authority on Spanish paintings.

He was widely regarded as the foremost authority on the 28th President.

He was the foremost Cuban authority on international law through his death.

He was recognized as a foremost authority on late 19th-century art.

By the 1950's, he was widely recognized as the country's foremost authority in that field.

At the time of his death he was considered the foremost authority on the Moon.

How does it rate in the eyes of the world's foremost authority on chicken salad?

He is considered one of Germany's foremost authorities on international relations and strategic issues.

He was considered the foremost authority of aviation law among the nation's 500 federal judges.