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. 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.
"At its core, the play is about what we all sacrifice to be successful, whatever our careers or goals," he explains.He is originally from New Jersey and is usually seen wearing his characteristic black framed glasses, neutral colored sweat jackets, brown trousers, and physics-themed t-shirts.\n\n","caption":"","link Href":"\/wiki\/File: Johnny_Galecki_(The_Big_Bang_Theory).jpg","title":"Johnny Galecki (The Big Bang Theory).jpg","db Key":"Johnny_Galecki_(The_Big_Bang_Theory).jpg"},,,,,,,,,,,,,,,,,,,,,,,,,,,,,,]" data-expanded="0" Leonard Hofstadter ‧ Sheldon Cooper ‧ Penny Hofstadter ‧ Howard Wolowitz ‧ Rajesh Koothrappali ‧ Amy Farrah Fowler ‧ Bernadette Rostenkowski-Wolowitz ‧ Stuart Bloom ‧ Emily Sweeney ‧ Leslie Winkle The Social Group Debbie Wolowitz ‧ Barry Kripke ‧ Priya Koothrappali ‧ Dr. The pair play Penny and Leonard on the long-running CBS sitcom.In 1989 Galecki portrayed Rusty Griswold in National Lampoon's Christmas Vacation. Galecki was cast in the 1997 summer I Know What You Did Last Summer and the 1998 dark comedy The Opposite of Sex.One of his best known roles was as David Healy (first introduced as Kevin Healy) in the U. In the year 2000, Galecki reunited with The Opposite of Sex director Don Roos, who cast him in Bounce.