Multiple realities(covers information from several alternate timelines)
David Rossi (also known as Dave Rossi) was a Human Starfleet officer in the 24th century.
In 2354, he was named as a Starfleet Operational Support Services officer on the directory placard at Starbase 32, Maxia sector. His room number was 35951. Rossi shared this room with Merri Howard, Diane Overdiek, Cheryl Gluckstern, Brad Yacobian, Doug Dean, Adele Simmons, Arlene Fukai, and Cosmo Genovese. (TNG: "Violations", directory)
In 2372, he was named as a Starfleet Command officer on the dedication plaque of the USS Enterprise-E. (Star Trek: First Contact, dedication plaque)
In an unknown, alternate future timeframe, he was named as an Advanced Technologies officer on the dedication plaque of the USS Pasteur. (TNG: "All Good Things..." dedication plaque)