During his doctoral studies in Anthropology at Oxford University, William Selkirk discovered several indigenous legends of revered individuals who could run at Inhuman speeds all across the globe. Eventually his research brought him to America where upon discovering a rift in the Speed Force, he was pulled through on July 17th, 1911 and became the leader of the Outpost of similar individuals in the Speed Force. Selkirk helped Barry Allen when he arrived at the Outpost but later attempted to use him as a lightning rod to escape. Though he succeeded, Selkirk was horribly disfigured and blamed it on the Flash though failed to defeat him. After this confrontation, he was recruited by Professor Zoom who promised to teach him more about the Speed Force.
Note: Selkirk's 1'st name has been given as William and Alexander