Doctor Martin Rackham was the chief medical officer aboard the USS Strata, serving under Captain Jason Stone.

He made a note in Chu'lak's Starfleet personnel file which stated that the Vulcan exhibited some possible psychological instability. (DS9: "Field of Fire")

This character was only mentioned in writing.
Doctor Rackham was named after actor Marty Rackham, who played Chu'lak in the episode. This information was seen on the screen when Ezri and Joran access Chu'lak's file.
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