Mark O'Connor is known for Cardboard Gangsters (2017), Stalker (2012) and Calvary (2014).

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Get a closer look at some of Hollywood's perfect pairs.

Hollywood Power Couples

Get a closer look at some of Hollywood&#39;s perfect pairs.

"The Gentlemen" and "Slow Horses" return this fall, while the "Reacher" spin-off series "Neagley" makes its debut. See our guide of the biggest Fall TV and streaming releases.

2026 Fall TV and Streaming Watch Guide

&quot;The Gentlemen&quot; and &quot;Slow Horses&quot; return this fall, while the &quot;Reacher&quot; spin-off series &quot;Neagley&quot; makes its debut. See our guide of the biggest Fall TV and streaming releases.

Get a closer look at these actors from their many TV and streaming series roles.

Streaming Stars, Then and Now

Mark O'Connor and Barry Keoghan in Stalker (2012)

Peter Coonan and Mark O'Connor in Stalker (2012)

Fionn Ó Loingsigh, John Connors, Paul Alwright, and Ryan Lincoln in Cardboard Gangsters (2017)

Peter Coonan, Barry Keoghan, and John Connors in Stalker (2012)

Mark O'Connor(VII)

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