This program was designed to provide extensive background environmental data, which continued for five years.

A leader, typically an older member with a more extensive criminal background, runs each set.

He had a very extensive background in music while still young.

"And a lot of it has to do with the fact that John does have a very extensive classical background."

He has an extensive background in public, federal and state administration.

Has an extensive background in public, federal and state administration.

Each has an extensive background in athletics, racing, and service.

While having an extensive background in English, she encountered problems with the management of her classroom.

Kelly has an extensive background in nonprofit management, media, and social service.

He was the first director of a major national laboratory to have an extensive industrial background.