How to use "experts" in a sentence

He mutilated only the faces of Eddowes and Kelly, which, in the opinion of modern experts, indicates that he knew them.

Bill Jaborski was supposed to be one of the ten top winter-survival experts in the country

"They had the best wilderness clothing and the best down-lined sleeping bags, the best winter tents, plenty of charcoal and other heat sources, plenty of food, and two wilderness experts to guide them

He was so good that he could safely take young boys into the Sierras for sixteen years, a challenge a lot of other winter survival experts wouldn't touch