Commander Mark Reasons was a male Human crewmember on board the USS Enterprise-D in the 24th century. In 2364, he was assigned in Stores and Supplies. He was talking to Jean-Luc Picard when the latter met Wesley Crusher, Data and William Riker coming out of the holodeck. Picard promised to meet him after. (TNG novelization: Encounter at Farpoint)

Reasons was referred to as "commander", it is possible he was either a lieutenant commander or a full commander.

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