According to Richard Clarke the former White House counterterrorism chief Bush was so obsessed with Iraq that he failed to take action against Osama Bin Laden despite repeated warnings from his intelligence experts.

I'm not an expert on the Malaysian sense of humor.

For it is the duty of an astronomer to compose the history of the celestial motions through careful and expert study.

The German national character is a favorite subject of character experts probably because the less mature a nation the more she is an object of criticism and not of history.

Most foreign policies that history has marked highly in whatever country have been originated by leaders who were opposed by experts.

I brought together experts from health care business academic institutions and the community to develop a comprehensive blueprint for eliminating racial and ethnic disparities in health care in the City of Boston.

The World Health Organisation has a lot of its medical experts sitting in Geneva while hospitals in Africa have no drugs and desperate patients are forced to seek medication on the black market.

As a freelance writer I'd be asked to become an expert for various magazines on any subject whether food or wine or history or the life span of veterinarians. I was completely unschooled in any of these things.

My expertise was in public finance particularly corporate taxation since I had worked at the US Treasury.

As a medical doctor it is my duty to evaluate the situation with as much data as I can gather and as much expertise as I have and as much experience as I have to determine whether or not the wish of the patient is medically justified.