The Skaggs Y-DNA project has tested multiple descendants of Old Peter Skaggs and the Long Hunters. These testers all descend from a single common ancestor with the R-BY44771 haplogroup. The genealogies of the test participants indicate that this common ancestor lived in the late 1600s to early 1700s.
I don't know much about William Brock Skaggs and that's unfortunate because he was the common ancestor for two testers in the Skaggs Y-DNA project. He was a grandson of the Rev. James "Longman" Skaggs of the Long Hunter group of Skaggs, born about 1796. He married Nancy Warren about 1815 and lived out his life in Green County, Kentucky dying sometime after the 1860 census. William Brock Skaggs had the R-BY114454 haplogroup in the Skaggs genetic lineage, shown below:
