For the mirror universe counterpart, please see B. Marrello (mirror).
B. Marrello was a Starfleet officer in the 23rd century.
Marrello was named as one of the yard engineers at the San Francisco Yards who were listed on the dedication plaque of the USS Enterprise. (SNW: "Strange New Worlds")
This character was only mentioned in writing.
This officer was named after second assistant director Ben Marrello.