"Come on, Jack, you just heard the world expert say it was impossible."

Andy Thomas is a world leading expert on the subject and he questions everything.

"Suddenly we've declared thousands of people in a primitive field as world experts, and they're trying to have their day."

She is a world expert on fresh water issues and related ecosystems.

Members of the committee are considered to be world experts on viruses.

Schoolchildren have been getting a helping hand with their nature studies - from a world famous expert.

Case Conference was designed to try to get a fresh look at a problem patient by bringing in a world expert to talk things over.

All of them were world experts in their fields, at least four the very best there was.

We'd encouraged him to go to the world experts, at the world's best hospitals, down in Boston.

"After what you've seen of the world experts here?"