Biography - Mark O'Brien

Last Modified: 9th Sep, 2023
Mark O'Brien
Best Known For
Republic of Doyle (TV series)
Net Worth
$5.00M Under Review
$ Under Review
Social Media Presence
Personal Detail
Birth Name / Full Name
Mark O'Brien N/A
Born on
May 7, 1984 (age 40)
Male N/A
Sexual Orientation
Marital Status
Married Date
3 (Older sisters)
Georgina Reilly
Georgina Reilly
Penelope O'Brien
Penelope O'Brien
Body Measurement
Hair Color
Eye Color
Blue N/A
Shoe Size
Bicep Size
inch N/A
Chest Size
inch N/A
Waist Size
inch N/A
Dress Size
Bust Size
inch N/A
Waist Size
inch N/A
Hip Size
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Social Media Presence

Who is Mark O'Brien?

Mark O'Brien is an actor, director by profession, and Canadian by nationality. He is best known for starring in the Republic of Doyle as Des Courtney and in Halt and Catch Fire as Tom Rendon.

Mark O'Brien – Bio, Age, Parents, Siblings

Mark O'Brien’s birth took place on May 7, 1984, in St. John's, Newfoundland, Canada. His mother worked as a nurse while his father worked as a truck driver. He is not the only child of his parents and has three siblings - older sisters.

Young Mark O'Brien (Source: Instagram)

Education, Ethnicity

After graduating from high school he attended Memorial University, graduating with an English major with a Bachelor of Arts. Other details of his early life including that of his mother, father, and the rest of the family are limited and will be updated.

His ethnicity includes Irish, among others.

Mark O'Brien – Girlfriend, Wife, Children

Mark O'Brien married his longtime girlfriend Georgina Reilly on 6 January 2013 after years of dating. They had first met on the set of the hit show Republic of Doyle

Reilly is an English actress and has starred in The Baker and the Beauty as Piper, City on a Hill as Corie Struthers, and in Goalie Movie as Pat Morey.

He and his wife have a child together. Their daughter Penelope O'Brien was born in November 2017. Currently, the couple is raising their daughter and living their blissful marriage without rumors of extra-marital affairs or divorce.

Also read: Brittany Picolo Ramos - real estate agent, TV host of Selling the Big Easy 

Mark O'Brien, Georgina Reilly with their daughter Penelope O'Brien - posted December 2018 (Source: Instagram)

Mark O'Brien – Career

As an actor

Mark O'Brien has portrayed roles in dozens of movies and TV series. He has starred in films Downward Calling (2005), Epilogue (2008), Grown Up Movie Star (2009), Better People (2012), Len and Company (2015), Arrival (2016), How It Ends (2018), The Front Runner (2018), Goalie (2019), Marriage Story (2019), etc.

Over the years Mark O'Brien has starred in the TV series Republic of Doyle (2010-2014), Diary of a Deadly P.I. (2012), Hannibal (2014), Halt and Catch Fire (2015-2016), The Last Tycoon (2017), among others.

Also read: Chris Lowell - Actor, Photographer 


In addition to acting, Mark O'Brien has worked as a director, producer, and writer. He has directed around 6 short films including Downward Calling (2005), Pretty Girls (2008), and Better People  (2012). As a writer and producer, he has worked in Lying Awake (2006), among many others.


Mark O'Brien’s fellow Marriage Story cast includes Kyle Bornheimer, Julie Hagerty, and Merritt Wever.

Also read: Darin Brooks - Actor of Days of Our Lives 

Mark O'Brien, Allan Hawco in Republic of Doyle (Source: CelebrityPictures)

Mark O'Brien – Net Worth, Salary

His net worth is estimated at around $5 Million but the figure on his annual salary has not been shared with the public.

Mark O'Brien – Instagram, Facebook, Twitter

On social media, Mark O'Brien is active on Instagram, and Twitter with thousands of followers but is absent from Facebook. However numerous fan accounts have been set up in his name.

Also read: John David Washington - Actor 

Fact Check

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