This is where she met John Stuart Mackenzie, professor of philosophy at the University College, a Hegelian and author of philosophical works and text books.

In 1915, Barbara Foxley took over her role as Professor of Education[7] as Mackenzie and her husband went into early retirement to travel and write.

[8] It was not until after World War I, when travel had become possible again that she went, together with her husband, on two lecture tours, visiting India, Burma, Ceylon and Europe between 1920 and 1922, and Berkeley, California in 1923.

In August 1921 the couple were present at the Goetheanum in Dornach, Switzerland to take part in the Summer Art Course that had been organised by Baron Arild Rosenkrantz for English participants.

Rudolf Steiner spoke highly of them and of the philosophical works they had written, in particular Hegel's Educational Theory and Practice and Jack Mackenzie's Elements of Constructive Philosophy.

[9][12] Mackenzie joined the women's movement, co-founding the Cardiff and District Women's Suffrage Society and stood as Labour Party candidate in the 1918 general election for the newly created University of Wales constituency, losing to former Flintshire Liberal MP Herbert Lewis.

[14] John Mackenzie, her husband, died in December 1935 in their home in the village of Brockweir near Chepstow in Gloucestershire.