Brother Cassian served the Brothers of the Christian Schools - La Salle (De La Salle Brothers). He taught at St. Joseph's College from 1921 before being transferred to the newly opened La Salle College in 1932 as second Principal.
I think his name/signature appears under "La Salle College" (La Salle Relief Hospital) on the left on the "Day Joyce Sheet" held by the Imperial War Museum.
See: https://www.iwm.org.uk/collections/item/object/30083388. An explanation of the "Day Joyce Sheet" is given at: https://gwulo.com/media/46458
After the fall of Hong Kong, Brother Cassian made his way to French Indo-China and reunited with other ex-Hong Kong De La Salle Brothers.
Source
1. https://en.wikipedia.org/wiki/Brigant_Cassian
2. The Hong Kong Lasallian Story: https://mission.catholic.org.hk/wp-content/uploads/2019/02/The-Hong-Kong-Lasallian-Story.pdf
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