History of character has not yet been written.
- 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.
- Jeff Smith first appeared in Earth-One continuity in Showcase #20 by Jack Miller and Ruben Moreira. He was reintroduced in Post-Crisis New Earth continuity in Swamp Thing (Volume 2) #86 by Rick Veitch and Tom Yeates.
- The Post-Crisis version of Jeff Smith is African-American as opposed to Caucasian like his Earth-One counterpart.
- Owns a white cat.
- 12 Appearances of Jeffrey Smith (New Earth)
- 3 Images featuring Jeffrey Smith (New Earth)
- 1 Quotations by or about Jeffrey Smith (New Earth)
- Character Gallery: Jeffrey Smith (New Earth)
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