One of the many things that Ensign Mariner griped about was how Lieutenant Commander Andy Billups had once called her "Jen" because he'd never bothered to learn her name prior to finding out she was Captain Freeman's daughter. After Boimler was promoted to lieutenant junior grade and transferred to the USS Titan, Jen was one of the people who yelled at Mariner to be quiet and stop yelling into her PADD. (LD: "No Small Parts")
Jennifer was voiced by Lauren Lapkus.
She was portrayed as a non-speaking background character until "No Small Parts". Jennifer's name was first mentioned in "Cupid's Errant Arrow".