Michael Piller was a member of Starfleet in the 24th century.

In 2353, Piller was listed on a directory placard as having an office in room 15910 on Starbase 32. (TNG: "Violations")

Additionally, admiral Piller was listed as a Starfleet Command official on the dedication plaque of several starships :

• (23??) USS Pasteur (NCC-58925)(Starfleet Command)
• (2363) USS Phoenix (NCC-65420) (Exploratory Division)
• (2363) USS Enterprise (NCC-1701-D) (Starfleet Command)
• (2367) USS Sutherland (NCC-72015) (Exploratory Division)
• (2370) USS Defiant (NX-74205) (Starfleet Command)
• (2371) USS Voyager (NCC-74656) (Starfleet Command)
• (2372) USS Valiant (NCC-74210) (Starfleet Command)
• (2375) USS Sao Paulo (NCC-75633) (Starfleet Command)

His name appeared also in the USS Voyager crew manifest in 2374, with a lieutenant commander rank. (VOY: "The Killing Game")