Marjorie Monaghan

Marjorie Susan Monaghan (born March 19, 1964) is an American actress best known for her portrayal of Tessa Halloran (aka 'Number One') in the television series Babylon 5.

Early life
Monaghan was born March 19, 1964, in Orange County, California. She is of Irish-Celt ancestry and started acting in high school.

Career
Monaghan has performed in a number of science fiction television roles, including starring as "JoJo" in Space Rangers  and an episode of Star Trek: Voyager. In 1999 she appeared in all eight episodes of Rescue 77 as a character named "Kathleen Ryan".

Monaghan is best known for her appearances in 7 episodes of Babylon 5 as a character named "Number One" (Tessa Holloran).

Personal life
Monaghan started dating Grant Rosenberg in 2001 whom she later married on February 2, 2011.