Marie was born in December 1899 and educated at a convent school, Immaculate Heart Convent. Parents were Joseph J. Mosquini (1866–1934) and Marianne Leonis (1874–1944)
Marie appeared in 202 silent films between 1917 and 1929. She holds the record for the most appearances in a Hal Roach-produced film by a female actress.
She was previously married to Ray Harlow (married 1923 - divorced 1927).
In Census of 1940, Lee and Marie M. share the household alone in Los Angeles, California.
In 1968, Marie De Forest became a well known Novice Class amateur radio operator and member of the Lockheed-affiliated LERC Amateur Radio Club.
Her call sign was WB6ZJR.
She passed away in 1983.
Sources
Listed as a Novice Class in the Spring of 68 Call Book. “Marie M. deForest.”
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M9PV-KCM : accessed 8 November 2021), Mary Mosquni in household of Joseph Mosquni, Precinct 56 Los Angeles city Ward 7, Los Angeles, California, United States; citing enumeration district (ED) 76, sheet 5A, family 86, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,090.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K9CK-1V4 : accessed 16 April 2018), Marie M Deforest in household of Lee Deforest, Councilmanic District 2, Los Angeles, Los Angeles Township, Los Angeles, California, United States; citing enumeration district (ED) 60-174, sheet 65A, line 25, family 417, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 404.
"California Death Index, 1940-1997," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VG13-15M : 26 November 2014), Marie Mosquini Deforest, 21 Feb 1983; Department of Public Health Services, Sacramento.
Find a Grave, database and images (https://www.findagrave.com/memorial/23195821/marie-de_forest : accessed 08 November 2021), memorial page for Marie Mosquini De Forest (3 Dec 1899–21 Feb 1983), Find A Grave: Memorial #23195821, citing San Fernando Mission Cemetery, Mission Hills, Los Angeles County, California, USA ; Maintained by Natalia Danesi (contributor 46834833) .
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