He was named principal investigator to study the samples which they brought back from the Moon.

"I really apologize again to have made a big mistake as a principal investigator," he wrote.

The entire group consisted of 10 principal investigators and five mission specialists.

He is also the principal investigator and senior author of the largest national study ever conducted on social distance.

It removed her as a principal investigator and continued its drug study.

The extraordinary thing about being a principal scientific investigator is that I should have been a psychology major.

As principal investigator on the director's staff, he could very well request such action of the patrol captain.

I have read all the published papers concerning it, and talked with many of the principal investigators.

The principal investigators of both studies think they know the problem.

As of 2011, the principal investigators collectively have over 150 journal publications.