- Mary Johnson was married to the actor Rudolf Klein-Rogge. They had one son who died in 1943.
- When her son died in 1943 she lost the sense to the reality and became more fatally in the next years. Rudolf Klein-Rogge's care was applied to her on the verge of his death.
- Because of her sensitive performance and her dainty appearance she was often compared with Mary Pickford, Bessie Love and Lillian Gish.
- It seems that Mary Johnson - at this time she already lived again in Sweden for many years - appeared bewildered in her former domicile in Wetzelsdorf where she summoned for her husband and her son.
- When the Swedish film production got into a crisis in the 20's she went to Germany.
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