Mark Duplass

Duplass in 2013, photo by Prphotos.com

Birth Name: Mark David Duplass

Place of Birth: New Orleans, Louisiana, U.S.

Date of Birth: December 7, 1976

Ethnicity: Cajun French, German, Swiss-German, one quarter Italian/Sicilian, some Ashkenazi Jewish, likely some Creole/African

Mark Duplass is an American actor, writer, director, producer, and musician. His brother is filmmaker and actor Jay Duplass. Known as The Duplass Brothers, they co-directed the films The Puffy Chair, Baghead, Cyrus, Jeff, Who Lives at Home; and The Do-Deca-Pentathlon; all of which they co-wrote. They co-created the shows Togetherness, which he also starred on, and Room 104, both of which they also directed and wrote episodes for. Mark also wrote the films Black Rock and Blue Jay; and co-wrote the films Creep, Creep 2, Unlovable, Paddleton, Language Lessons, and Biosphere. As an actor, Mark has starred in Humpday, Safety Not Guaranteed, the Creep films, Tammy, The One I Love, The Lazarus Effect, Blue Jay, Tully, Paddleton, Bombshell, and Language Lessons, and also on the shows The League, The Mindy Project, Goliath, and The Morning Show. Mark and Jay started the production company Duplass Brothers Productions. Mark is also the lead singer of indie rock band Volcano, I’m Still Excited!!

Mark was raised Catholic. He is married to filmmaker and actress Katie Aselton, with whom he has two children.

Mark is a second cousin, once removed, of actor Bryan Batt. Mark’s paternal great-great-grandparents, August Spraul and Olivia Caselia Rossvalley/Rosevalley, were also Bryan’s paternal great-grandparents.

A 23andMe DNA test taken by Mark’s brother Jay stated that Jay’s genetic ancestry is:

*15% Ashkenazi Jewish

Mark’s paternal grandfather was Lawrence Stein Duplass (the son of John Theodore/B. Duplass and Orene/Irene Frances Stein). Lawrence was born in Louisiana. John was born in Louisiana, and may have been the son of Felix Duplessis and Regina, who were Creole. Orene was the daughter of Adolphe/Adolph Jacob Stein, who was a German Jewish immigrant, and of Mary Aufdemorte, whose parents were German.

Mark’s paternal grandmother was June Sehrt (the daughter of daughter of John J. Sehrt and Norma Othilda Spraul). Mark’s grandmother June was born in Louisiana. Mark’s great-grandfather John was of German descent, and was the son of William F. Sehrt and Katherine/Catherine/Katie Sulfsted, both of whom were the children of immigrants. Norma was the daughter of August Spraul, whose parents were German, and of Olivia Caselia Rossvalley/Rosevalley, who was of half German Jewish and half German (Christian) background. Olivia’s father, Max Louis Rosevalley/Mordechai Rosenthal, was born in Laupheim bei Ulm, Wuertemberg, to a Jewish family; he was a surgeon in the Louisiana militia, who was also a robber and a thief, and a spy during the Civil War. He converted to Christianity.

Mark’s maternal grandfather was John Anthony Ernst, Jr. (the son of John Anthony Ernst and Leontine Pauline Bordes). John was the son of Joseph Ernst/Earnest, whose parents were German, and of Josephine Keller, whose parents were Swiss-German. Leontine was the daughter of French parents, Alexandre Bordes and Marie Sauné.

Mark’s maternal grandmother was Cathryn/Catherine Mae Gallo (the daughter of Salvadore “Samuel” George Gallo and Theresa M. Corceller). Cathryn was of Italian/Sicilian descent, with roots in Ustica island. Theresa was the daughter of Giuseppe Caserti/Caserta/Cazzetta/Corceller and Caterina/Catherine Rando.

Sources: Marriage record of Mark’s paternal grandparents, Lawrence Stein Duplass and June Sehrt –

Mark’s paternal grandfather, Lawrence Stein Duplass, on the 1920 U.S. Census –
Lawrence Stein Duplass on the 1930 U.S. Census –

Mark’s paternal great-grandmother, Orene/Irene Frances Stein, on the 1900 U.S. Census –
Orene/Irene Frances Stein on the 1910 U.S. Census –

Marriage record of Mark’s paternal great-great-grandparents, Adolphe/Adolph Jacob Stein and Mary Aufdemorte –

Mark’s paternal grandmother, June Sehrt, on the 1930 U.S. Census –

Mark’s paternal great-grandfather, John J. Sehrt, on the 1910 U.S. Census –
John J. Sehrt on the 1920 U.S. Census –

Marriage record of Mark’s paternal great-great-grandparents, William F. Sehrt and Katherine/Catherine/Katie Sulfsted –

Mark’s paternal great-grandmother, Norma Othilda Spraul, on the 1920 U.S. Census –

Genealogy of Mark’s paternal great-great-grandparents, August Spraul and Olivia Caselia Rossvalley/Rosevalley –

Marriage record of Mark’s paternal great-great-grandparents, August Spraul and Olivia Caselia Rossvalley/Rosevalley –

Marriage record of Mark’s maternal great-grandparents, John Anthony Ernst and Leontine Pauline Bordes –

Mark’s maternal great-grandfather, John Anthony Ernst, on the 1900 U.S. Census –

Mark’s maternal great-great-grandparents, Joseph Ernst/Earnest and Josephine Keller, on the 1880 U.S. Census –

Genealogy of Mark’s maternal great-grandmother, Theresa M. Corceller (focusing on her father’s side) –

Marriage record of Mark’s maternal great-great-grandparents, Giuseppe Caserti/Caserta/Cazzetta/Corceller and Caterina/Catherine Rando –