Regitz was a 24th century career Starfleet officer.
By the 2370s decade, Regitz had achieved the rank of captain. In the year 2371, Regitz was the commanding officer of the Federation starship USS Mukaikubo.
In that year, the Mukaikubo was stationed at Starbase 1, but was later sent to Starbase Deep Space 9 to help against the suspected Furies invasion. (DS9 - Invasion! novel: Time's Enemy)