Acting
Donald Sage Mackay
Known for
Highlights
House
2004 · Series · Neil
Malcolm in the Middle
2000 · Series · Man
Modern Family
2009 · Series · George
Mad Men
2007 · Series · Dr. Gosman
NCIS
2003 · Series · Kerry Killmartin
Red, White & Royal Blue
2023 · Film · Jeffrey Richards
Filmography
Movies
7 films
Nuremberg
2025 · Film · Senator William Fulbright
Mystery Island: House Rules
2025 · Film · De. Stanley Wellington
The Great Escaper
2023 · Film · Nathan
Red, White & Royal Blue
2023 · Film · Jeffrey Richards
The Good Mother
2013 · Film · Bob
Play the Game
2009 · Film · Retirement Home Director
The Swan Princess: The Mystery of the Enchanted Kingdom
1998 · Film · Jean-Bob (voice)
Filmography
Series
29 shows
Going Dutch
2025 · Series · General Gus King
Eric
2024 · Series · Jerry
The Regime
2024 · Series · Richard Kaiser
The Following Events Are Based on a Pack of Lies
2023 · Series · Norm Niedecker
Wreck
2022 · Series · Henry Allan
Cell 8
2022 · Series · Pedersen
Alex Rider
2020 · Series · General Lomis
Treadstone
2019 · Series · Greg Sanders
Tom Clancy's Jack Ryan
2018 · Series · CJCS Jeff Maguire
Masters of Sex
2013 · Series · John Watson
Elementary
2012 · Series · Ben
Blue Bloods
2010 · Series · Lt. Mike Collier
Modern Family
2009 · Series · George
The Good Wife
2009 · Series · Mike Pedrano
Mad Men
2007 · Series · Dr. Gosman
Weeds
2005 · Series · TSA Agent Warren
House
2004 · Series · Neil
NCIS
2003 · Series · Kerry Killmartin
What I Like About You
2002 · Series · Super
According to Jim
2001 · Series · Greg
Scrubs
2001 · Series · Doctor
The District
2000 · Series · Reporter #1
Malcolm in the Middle
2000 · Series · Man
The West Wing
1999 · Series · Ellis
Providence
1999 · Series · Officer Duncan
The Practice
1997 · Series · Howard McGowan
JAG
1995 · Series · Pilot
ER
1994 · Series · Detective Lash
Frasier
1993 · Series · Eduardo
