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John Mark Galecki is an American actor. He played Leonard Hofstadter in the CBS sitcom The Big Bang Theory (2007–2019) and David Healy in the ABC sitcom Roseanne. Galecki also appeared in the films National Lampoon's Christmas Vacation (1989), Prancer (1989), Suicide Kings (1997), I Know What You Did Last Summer (1997), Bookies (2003), In Time (2011), and Rings (2017).
Birth Name
John Mark Galecki
Born
Wednesday, 30 April 1975
Links
Actor Filmography
| Title | Character | Year |
|---|
| History of the Sitcom | Leonard Hofstadter | 2021 |
| A Dog's Journey | Henry / Henry Montgomery | 2019 |
| The Conners | David Healy | 2018 |
| SciJinks | Self - Host | 2018 |
| The Cleanse | Paul Berger / Paul | 2018 |
| Rings | Gabriel / Gabriel Brown | 2017 |
| For the Love of Spock | Leonard Hofstadter | 2016 |
| Must See TV: A Tribute to James Burrows | Self | 2016 |
| The Late Show with Stephen Colbert | Self | 2015 |
| Lip Sync Battle | Self - Guest | 2015 |
Actor Filmography
| Title | Character | Year |
|---|
| History of the Sitcom | Leonard Hofstadter | 2021 |
| A Dog's Journey | Henry / Henry Montgomery | 2019 |
| The Conners | David Healy | 2018 |
| SciJinks | Self - Host | 2018 |
| The Cleanse | Paul Berger / Paul | 2018 |
| Rings | Gabriel / Gabriel Brown | 2017 |
| For the Love of Spock | Leonard Hofstadter | 2016 |
| Must See TV: A Tribute to James Burrows | Self | 2016 |
| The Late Show with Stephen Colbert | Self | 2015 |
| Lip Sync Battle | Self - Guest | 2015 |
| The Late Late Show with James Corden | Himself | 2015 |
| The 41st Annual People's Choice Awards | Self | 2015 |
| CBGB | Terry Ork | 2013 |
| Celebrity Page | Self | 2013 |
| The Love Me Cat Show | Self - Guest | 2013 |
| Larry King Now | Self - Guest | 2012 |
| The 69th Annual Golden Globe Awards | Self - Nominee | 2012 |
| In Time | Borel | 2011 |
| Conan | Himself - Guest | 2010 |
| The Talk | Self, Self - Guest | 2010 |
| The 36th Annual People's Choice Awards | Self | 2010 |
| Table for Three | Ted | 2009 |
| Hancock | Jeremy | 2008 |
| The Big Bang Theory | Leonard Hofstadter | 2007 |
| Blvd. of Broken Dreams | Self | 2007 |
| My Boys | Trouty | 2006 |
| Rachael Ray | Self - Guest | 2006 |
| Made in Hollywood | Self | 2005 |
| My Name Is Earl | Scott | 2005 |
| Happy Endings | Miles | 2005 |
| American Dad! | Arnie | 2005 |
| The Late Late Show with Craig Ferguson | Himself - Guest | 2005 |
| LAX | Leland Pressman | 2004 |
| Entourage | Johnny Galecki | 2004 |
| Chrystal | Barry | 2004 |
| Hope & Faith | Jay | 2003 |
| The Ellen DeGeneres Show | Self | 2003 |
| Jimmy Kimmel Live! | Himself - Guest | 2003 |
| Bookies | Jude | 2003 |
| Last Call with Carson Daly | Himself | 2002 |
| Vanilla Sky | Peter Brown | 2001 |
| Bounce | Seth | 2000 |
| Playing Mona Lisa | Arthur | 2000 |
| Norm | Dale Stackhouse | 1999 |
| Morgan's Ferry | Darcy | 1999 |
| Family Guy | Leonard Hofstadter | 1999 |
| Batman Beyond | Knux | 1999 |
| The Roseanne Show | Self - Guest | 1998 |
| The Opposite of Sex | Jason Bock | 1998 |
| Suicide Kings | Ira Reder | 1998 |
| I Know What You Did Last Summer | Max Neurick | 2016 |
| I Know What You Did Last Summer | Max / Max Neurick | 1997 |
| The View | Himself | 1997 |
| Bean | Stingo Wheelie | 1997 |
| Murder at My Door | Teddy McNair | 1996 |
| The Daily Show | Self - Guest | 1996 |
| Without Consent | Marty | 1994 |
| Extra with Billy Bush | Self | 1994 |
| Late Show with David Letterman | Himself - Guest | 1993 |
| A Family Torn Apart | Daniel Hannigan | 1993 |
| Billy | David MacGregor | 1992 |
| Civil Wars | Greg Stolbach | 1991 |
| Backfield in Motion | Tim Seavers | 1991 |
| In Defense of a Married Man | Eric | 1990 |
| American Dreamer | Danny Nash | 1990 |
| Blossom | Jason | 1990 |
| Blind Faith | John Marshall | 1990 |
| National Lampoon's Christmas Vacation | Rusty | 1989 |
| Prancer | Billy Quinn | 1989 |
| Roseanne | David Healy, Kevin Healy | 1988 |
| A Night in the Life of Jimmy Reardon | Toby Reardon | 1988 |
| Murder Ordained | Doug Rule | 1987 |
| Entertainment Tonight | Self, Himself | 1981 |
| Sesame Street | Self | 1969 |
Producer Filmography
| Title | Year |
|---|
| SciJinks | 2018 |
| The Cleanse | 2018 |
| Living Biblically | 2018 |
| Year | Type | Category | Won |
|---|
| 2012 | Golden Globe | Best Performance by an Actor in a Television Series - Comedy or Musical | Nominated |
| 2011 | Emmy | Outstanding Lead Actor in a Comedy Series | Nominated |
