Jeffrey Smith (Earth-One)

Temporal Mechanics: Jeff Smith is an expert in the field of temporal mechanics, quantum theory and the relationship between energy and matter as it pertains to the Space/Time continuum.

Paraphernalia

This version of Jeffrey Smith (Earth-One), including all history and corresponding appearances, was erased from existence following the collapse of the original Multiverse in the 1985–86 Crisis on Infinite Earths event and later restored following the rebirth of the infinite Multiverse during the Dark Crisis of 2022-2023. Even though other versions of the character may have appeared, this information does not apply to those versions.
Jeff Smith is retconned as a African-American man in the Post-Crisis.