Mae Judith wedi bod yn gwneud y swydd ar sail dros dro ers mis Tachwedd 2021, ac wedi cael ei phenodi ar sail barhaol yn dilyn ymarfer recriwtio rhyngwladol trwyadl dan gadeiryddiaeth Prif Gomisiynydd y Gwasanaeth Sifil.
Judith has been in the post on an interim basis since November 2021, and has been appointed permanently following a rigorous international recruitment exercise chaired by the First Civil Service Commissioner.