For the mirror universe counterpart, please see A. Tsang (mirror).
A. Tsang was a Starfleet officer in the 23rd century.
Tsang was listed as a Tactical Ops officer on the dedication plaque of the USS Discovery. (DIS: "Context Is for Kings", dedication plaque)
Tsang was listed as a Science Ops officer on the dedication plaques of the USS Enterprise. (DIS: "Such Sweet Sorrow"; SNW: "Strange New Worlds")
This character was only mentioned in writing.
This officer was named after first assistant graphics artist Andy Tsang.