Margaret Blackwell
Vice admiral Margaret Blackwell was a 24th century Starfleet officer. 

In 2370, she ordered the  to rendezvous with the , but did not discuss further details via subspace. After having picked up Admiral Erik Pressman from the Crazy Horse to search for the , Captain Jean-Luc Picard got suspicious about the true nature of the mission and again contacted Blackwell, whom he knew on a first-name basis, to get more information. She refused, instead advising Picard to follow Pressman as the chief of Starfleet Intelligence was behind him. 

Admiral Blackwell also managed to embarrass Picard by asking about the nature of "Captain Picard Day." ()

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Humans
Starfleet personnel (24th century)
Starfleet command personnel
Starfleet flag officers