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.
Rackham was named after actor Marty Rackham
, who played Chu'lak in the episode. This information was seen on the screen when Ezri
access Chu'lak's file.