John Mark "Johnny" Galecki (born April 30, 1975) is a Belgian-born American actor. He is best known for his role as Dr. Leonard Hofstadter in the sitcom The Big Bang Theory since 2007 and as David Healy in the sitcom Roseanne from 1992 to 1997 and 2018. He also appeared in the films National Lampoon's Christmas Vacation (1989), Suicide Kings (1997), I Know What You Did Last Summer (1997), Bookies (2003), Hancock (2008), and In Time (2011).
Galecki was born in Bree, Belgium, to American parents of Polish, Irish, and Italian descent. His mother, Mary Lou (née Noon), was a mortgage consultant, and his father, Richard Galecki, was a member of the U.S. Air Force stationed in Belgium at the time and also worked as a rehabilitation teacher. He has a younger brother, Nick, whom he describes as a mechanical genius in the automotive industry and a younger sister, Allison. Galecki grew up in Oak Park, Ill. During an interview with Zealand radio station ZM, Galecki jokingly recalled his childhood relationship with his mother. As a child, he was well known for making up long, epic stories and tales. In such situations his mother used to make him play the "quiet game" where he had to see how long he could go without talking. He also recalled that despite being a loving mother, she was also very tough. One phrase she would lovingly use was, "I love you, now get out."
Galecki made his acting debut in the 1987 CBS miniseries "Murder Ordained" with JoBeth Williams and future Roseanne co-star John Goodman. In 1989 Galecki portrayed Rusty Griswold in National Lampoon's Christmas Vacation. One of his best known roles was as David Healy (first introduced as Kevin Healy) in the U.S. sitcom Roseanne. Galecki was cast in the 1997 summer I Know What You Did Last Summer and the 1998 dark comedy The Opposite of Sex. In the year 2000, Galecki reunited with The Opposite of Sex director Don Roos, who cast him in Bounce.
Galecki continued his film streak with roles in Suicide Kings and brief bit parts in high-profile films such as Bean and a minor supporting part in Vanilla Sky. Galecki played a young delinquent in A Family Torn Apart, a TV movie based on a true story about a serial killer.
Galecki appeared in the first-season episode, "Stole Beer from a Golfer", of My Name is Earl as a golfer.
He played a character named Trouty on TBS's sitcom My Boys. He also played the half-brother of the main characters, sisters Hope Shanowski and Faith Fairfield, in the TV sitcom Hope & Faith. In late 2006/early 2007, Galecki starred in the Broadway play The Little Dog Laughed as Alex, a male prostitute. In this role, he was required to do a full-frontal nude scene, the first of his acting career. "At its core, the play is about what we all sacrifice to be successful, whatever our careers or goals," he explains. Galecki originated the role earlier in 2006 at Second Stage Theater. The widely popular comedy by Douglas Carter Beane had a successful run at Second Stage and moved to the Cort Theater. The play closed on February 18, 2007, with Galecki taking home a 2007 Theater World Award for his performance.
Galecki currently plays the part of Leonard Hofstadter in the CBS sitcom The Big Bang Theory, which debuted September 24, 2007. He works alongside two of his former Roseanne cast members, Sara Gilbert, who during his role as David Healy played the role of his longtime girlfriend and later his wife, Darlene Conner, as well as Laurie Metcalf, formerly cast as the role of Rosanne Barr's fictionalized character's sister Jackie. Both have since appeared as recurring characters. Galecki is a cellist and has played cello on the show. On December 1, 2017, Galecki filmed a guest appearance as his character for an episode of Roseanne, then the revival sitcom has cancelled on May 29, 2018, after the racist Barr's ending Twitter.
In July 2011, Galecki played himself on three episodes of Entourage.
In 2018, Galecki who recently an executive producer in CBS short-lived sitcom Living Biblically.
After rebooting the "Rosanne" show, Johnny Galecki appeared on one episode in April 2018 as David Healy as Sara Gilbert's estranged husband returning to the series for a guest starring role.
While working on The Big Bang Theory, Galecki dated co-star Kaley Cuoco for two years. They kept their relationship private until they broke up.
In February 2012, it was revealed that Galecki had been dating actress Kelli Garner since 2011. Their relationship ended in 2014.
Johnny Galecki and Mayim Bialik worked together on her show "Blossom" before "The Big Bang Theory".
The Big Bang Theory
- Main article: Leonard Hofstadter
- Johnny Galecki was originally asked to take the part of Sheldon, but felt the role of Leonard suited his acting style better. The role of Sheldon was then taken by Jim Parsons.
- His 2015-2017 contract could be worth a total of $90 million.
- Both Johnny Galecki and Jim Parsons's fathers died in car accidents. Galecki's father died sometime between April 30, 1975 and April 29 1976 when Galecki was 16 and Parsons's father died on April 29, 2001 when Parsons was 28.
- Similar to how Johnny dated Sara Gilbert while they played boyfriend and girlfriend and eventual married couple, David and Darlene on Roseanne, Johnny have also dated Kaley Cuoco while they played boyfriend and girlfriend and eventual married couple, Leonard and Penny on The Big Bang Theory.
- Johnny Galecki shares the same birthday as his co-star, Kunal Nayyar (April 30th). The only difference is their birth years (Galecki - 1975, Nayyar - 1981).
- Admits that 2018-2019 will probably be the last season of TBBT as does Kaley. On August 22, 2018, the series of TBBT season 12 is officially announced that it would be the last.
-  - Wikipedia Site