From 1982, she worked as an editor and in 1987, she moved to the Technical University of Applied Sciences Lübeck as a press and public relations officer.

In 1997, she took over the management of the Technical University of Applied Sciences Lübeck's office for the participation in the "Leonardo Da Vinci" European vocational training and mobility programme.

[1] Gabriele Hiller-Ohm was a member of the parliament of the Hanseatic City of Lübeck from 1990 to 2002, and was chairwoman of the SPD parliamentary group there from 1999 to 2002.

[6] In the 2017 federal election, she ran for her constituency's direct mandate again,[7][8] but was defeated by the CDU candidate Claudia Schmidtke.

[13] Hiller-Ohm has long campaigned for the introduction of the statutory minimum wage and for a pension without deductions from 63 after 45 contribution years.

[14][15] As the responsible rapporteur for the SPD parliamentary group in the Bundestag,[16] she also lobbied for the quota of women on supervisory boards and for the Wage Justice Act.