I. Feinberg was a Starfleet officer in the 24th century who once served under Admiral Leyton.
Feinberg was assigned to Strategic Operations on stardate 49295 as part of Leyton's attempted military coup in 2372. (DS9: "Paradise Lost")
Feinberg's name was visible on a personnel assignment list viewed by Captain Sisko. This character appears to have been named after Star Trek's original property master Irving Feinberg.