Multiple realities(covers information from several alternate timelines)
Admiral Brad Yacobian was a Human Starfleet officer in the 24th century.
In 2345, as a vice admiral, he was named as a Fleet Administration officer on the dedication plaque of the USS Brattain. (TNG: "Night Terrors", dedication plaque)
In 2353, he was named as a Starfleet Operational Support Services officer on a directory placard at Starbase 32, Maxia Zeta. His room number was 35951. Yacobian shared this room with Merri Howard, Diane Overdiek, Cheryl Gluckstern, David Rossi, Doug Dean, Adele Simmons, Arlene Fukai, and Cosmo Genovese. (TNG: "Violations", directory)
In an unknown, alternate future timeframe, as an admiral, he was named as a Starfleet Command officer on the dedication plaque of the USS Pasteur. (TNG: "All Good Things..." dedication plaque)