In 1935, William was appointed to the Art Department of Moray House College of Education, and the couple returned to Edinburgh, where their three children, Paul, Erik and Catherine,[3] were born.

Monro Turner opened the glass engraving department at Edinburgh College of Art in January 1941, despite the challenges of obtaining equipment during the war period.

[5] At the time of Geissler's enrolment in 1945, ECA possessed a single glass engraving lathe that overheated, which allowed only intermittent and unreliable access, and had to be shared in shifts with Monro’s other student, Harold Gordon.

[7] Her skill in lettering and draughtsmanship brought her to the attention of Jan Tarnowski, director of the Scottish Craft Centre, whose advice and guidance were instrumental in bringing her many commissions.

A set of engraved goblets, representing ten of the heraldic Queen's Beasts (comprising the lion of England, the griffin of Edward III, the falcon of the Plantagenets, the black bull of Clarence, the yale of Beaufort, the white lion of Mortimer, the red dragon of Wales, the unicorn of Scotland, and the white horse of Hanover), was presented to Her Majesty the Queen by the High Constables and the Guard of Honour of Holyrood House for the Coronation in 1953.