Mancuso was a Starfleet medic with the rank of Ensign who served on Deep Space 9 in the 24th century.
In 2376, Mancuso and other medics were called to treat injured persons after a fight on the Promenade. Mancuso had responded so quickly that they were wearing a flowered bathrobe when they arrived on the scene. (DS9 - Mission Gamma novel: This Gray Spirit)