Leo lived in Beuthen at Gartenstrasse 16 when he witnessed his sister Hedwig's marriage in 1905, and with his parents at Gartenstrasse 14 when he reported his father's death in 1910.

The 1928 telephone directory lists Leo and his mother Henriette in Beuthen at Gartenstrasse 14 and Leo's lumber business at Hubertusstrasse 5.

The 1939 census of Beuthen lists Henriette, Leo and Leo's wife, Kaethe, at Hubertusstrasse 5.

Also at listed this address are, among others, Dr Bruno Pinkus born 14.05.1883 in Schweidnitz and his wife Gertrud Pinkus geb. Nossen born 14.10.1885 in Freiburg; their marriage certificate names their parents but does not suggest a close relationship to Markus.

Yad Vashem testimonials place him at Hubertusstrasse 4 and Hubertusstrasse 5.

Deported June 1942.