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.