Mērija Grīnberga Jr (1909-1975) was a member of the Grinbergs-Grosvalds family. This family was one of the most prominent families in the political and cultural life of Latvian society until 1940. From October 1944 to February 1946, she accompanied the most valuable items from the main Riga museum collections evacuated by Nazi Germany's state institutions to the Opava region in the present-day Czech Republic. Thanks to her efforts, most of the collection was preserved and returned to Riga, although she could not prevent the loss of some items through looting and transport (initially the collections were packed in approximately 700 boxes, she returned to Riga in February 1946 with 406 boxes). Her efforts were not acknowledged, she was interrogated by the security services, and in 1950 she was fired from her job at the museum, and had to work in a factory until 1958, when she found a job as a librarian in the State Museum of Latvian and Russian Art (now the Latvian National Museum of Art), where she worked until her death.